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Math Expert
Joined: 02 Sep 2009
Posts: 60480
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100 Hardest and easiest questions for DS
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 Updated on: 01 Jan 2020, 05:45
100 Hardest Data Sufficiency Questions (Dec 1st, 2019 - Jan 1st, 2020) Are you familiar with the GMAT Club's timer?We have pulled timer results from our database and analyzed every question in the forum. Based on those results, we have compiled a list of the hardest questions in each of the question forums we have. Below I am presenting to you the top 100 questions from DS forum. | Data Sufficiency (DS) | | Rank | Title | Topics | | 1 | Train A leaves New York for Boston at 3 PM and travels at | Difficulty: 700-Level, Distance/Rate Problems | | 2 | What is the perimeter of PQRS ? (1) x = 30 degree (2) w= 45 degree | Difficulty: 700-Level, Geometry | | 3 | In the correctly worked addition problem above, A, B, C, D | Difficulty: 700-Level, Arithmetic, Number Properties, Source: Manhattan GMAT | | 4 | w, x, y, and z are integers. If w > x > y > z > 0, is y a common | Difficulty: 700-Level, Divisibility/Multiples/Factors, Number Properties, Source: Manhattan GMAT | | 5 | A car dealership carries only sedans and SUVs | Difficulty: 700-Level, Percent and Interest Problems, Word Problems, Source: Veritas Prep | | 6 | If n is a prime number greater than 2, is 1/x > 1? | Difficulty: 700-Level, Exponents/Powers, Inequalities, Source: Manhattan GMAT | | 7 | n and k are positive integers. When n is divided by 23, the quotient i | Difficulty: 700-Level, Remainders, Source: GMATPrepNow | | 8 | If k is an integer and x(x – k) = k + 1, what is the value of x? | Difficulty: 700-Level, Algebra, Source: Other - Please specify | | 9 | If all the N students of a class are classified into groups of either | Difficulty: 700-Level, Divisibility/Multiples/Factors, Number Properties, Source: e-GMAT | | 10 | If, in the addition problem above, a, b, c, d, e, f, x, y, a | Difficulty: 700-Level, Arithmetic | | 11 | For integers a and b, if (a^3 a^2 b)^1/2 = 7, what is the | Difficulty: 700-Level, Algebra | | 12 | When 120 is divided by positive single-digit integer m the remainder | Difficulty: 700-Level, Absolute Values/Modulus, Divisibility/Multiples/Factors, Source: Other - Please specify | | 13 | Julian bought 6 kilograms of cheese from each of Deli A and Deli B. At | Difficulty: 700-Level, Word Problems, Source: 800 Score | | 14 | The average (arithmetic mean) of 5 distinct, single digit integers is | Difficulty: 700-Level, Number Properties, Source: Princeton Review | | 15 | The cost of 3 chocolates, 5 biscuits, and 5 ice creams is | Difficulty: 700-Level, Word Problems | | 16 | Right triangle ABO is drawn in the xy-plane, with OB as hypo | Difficulty: 700-Level, Geometry, Source: Manhattan GMAT | | 17 | Abe, Beth, Carl and Duncan are four siblings, among which Abe and Carl | Difficulty: 700-Level, Number Properties, Source: e-GMAT | | 18 | If h and k are both positive integers, are both roots of the equation | Difficulty: 700-Level, Algebra | | 19 | If 20 Swiss Francs is enough to buy 9 notebooks and 3 pencils, is 40 | Difficulty: 700-Level, Inequalities, Word Problems | | 20 | There is a sequence, 4(10^n), 4(10^(n-1)), ..., 4(10^(n-m)), for posit | Difficulty: 700-Level, Number Properties, Sequences, Source: Manhattan GMAT, Source: Math Revolution | | 21 | P and Q are prime numbers less than 70. What is the units digit of P*Q | Difficulty: 700-Level, Number Properties, Source: e-GMAT | | 22 | A red box contains 7 ropes, with an average length of 60 cm per rope, | Difficulty: 700-Level, Arithmetic, Min/Max Problems, Source: Other - Please specify | | 23 | If x, y, and z are all distinct positive integers and the percent | Difficulty: 700-Level, Algebra, Number Properties, Percent and Interest Problems, Source: Manhattan GMAT | | 24 | A certain fruit stand sells only apples for $0.26 each, bananas for $0 | Difficulty: 700-Level, Word Problems, Source: Veritas Prep | | 25 | W, X, Y, and Z represent distinct digits such that WX * YZ = 1995. Wha | Difficulty: 700-Level, Number Properties, Source: Veritas Prep | | 26 | A cube is made up of equal smaller cubes. Two of the sides | Difficulty: 700-Level, Geometry | | 27 | If a, b, and c are positive integers such that 1/a + 1/b = 1 | Difficulty: 700-Level, Fractions/Ratios/Decimals, Inequalities, Source: Manhattan GMAT | | 28 | A newer machine, working alone at its constant rate | Difficulty: 700-Level, Work/Rate Problems, Source: Veritas Prep | | 29 | What is b in the circle shown above? | Difficulty: 700-Level, Geometry, Source: Other - Please specify | | 30 | Three employees, A, B and C, clean a certain conference room each day. | Difficulty: 700-Level, Work/Rate Problems, Source: Other - Please specify | | 31 | The number of elements in set K is an odd number. The minimum value of | Difficulty: 700-Level, Statistics and Sets Problems, Source: Math Revolution | | 32 | If you are buying a product by rounding up to a $1 digit, is the sum o | Difficulty: 700-Level, Algebra, Arithmetic, Percent and Interest Problems, Poor Quality, Source: Math Revolution | | 33 | The Range of Set A is R. A number having equal value to R | Difficulty: 700-Level, Statistics and Sets Problems | | 34 | The numbers D, N, and P are positive integers, such that D < N, and N | Difficulty: 700-Level, Exponents/Powers, Number Properties, Source: Magoosh | | 35 | w, x, y, and z are integers. If z > y > x > w, is |w| > x^2 | Difficulty: 700-Level, Absolute Values/Modulus, Inequalities, Source: Kaplan | | 36 | A natural number p, when divided by a certain divisor q, gives | Difficulty: 700-Level, Number Properties, Remainders, Source: Jamboree | | 37 | In the picture, quadrilateral ABCD is a parallelogram and | Difficulty: 700-Level, Geometry | | 38 | At a restaurant, a group of friends ordered four main dishes | Difficulty: 700-Level, Min/Max Problems, Source: Manhattan GMAT | | 39 | If x, y and z are positive integers such that x^4*y^3 = z^2 | Difficulty: 700-Level, Number Properties, Source: e-GMAT | | 40 | Maria drove a distance without stopping such that she covered first | Difficulty: 700-Level, Distance/Rate Problems, Source: Other - Please specify | | 41 | There are N men in a group. Their average age is 20 years. Find N. | Difficulty: 700-Level, Statistics and Sets Problems, Source: Other - Please specify | | 42 | If x is positive, what is the value of |x – 3| – 2|x – 4| + | Difficulty: 700-Level, Absolute Values/Modulus, Inequalities, Source: Manhattan GMAT | | 43 | A three digit number A with hundreds digit a, tens digit b and units | Difficulty: 700-Level, Divisibility/Multiples/Factors, Number Properties, Source: Jamboree | | 44 | Is 1/(x-y) < y - x | Difficulty: 700-Level, Inequalities | | 45 | If a, b, x, y are positive integers and a^xb^y= 144, then a + b = ? | Difficulty: 700-Level, Algebra, Exponents/Powers, Source: Math Revolution | | 46 | Is x^3 - 6x^2 + 11x - 6 < 0 | Difficulty: 700-Level, Inequalities | | 47 | Is a - 3b an even number? | Difficulty: 700-Level, Number Properties | | 48 | In a sequence of 13 consecutive integers, all of which are | Difficulty: 700-Level, Divisibility/Multiples/Factors, Sequences | | 49 | The area of a rectangle is 28 square centimeter. What is the perimeter | Difficulty: 700-Level, Algebra, Geometry | | 50 | A set of positive integers contains twice as many even integers as odd | Difficulty: 700-Level, Divisibility/Multiples/Factors, Number Properties, Probability | | 51 | x, y are positive integers. Find the number of even factors of 4x^2 | Difficulty: 700-Level, Divisibility/Multiples/Factors, Source: e-GMAT | | 52 | In a group of 80 college students, how many own a car? | Difficulty: 700-Level, Overlapping Sets, Source: Magoosh | | 53 | If a and b are two-digit positive integers greater than 10 | Difficulty: 700-Level, Remainders, Source: GMAT Club Tests | | 54 | If pqr s is a four-digit number, where p, q, r and s are the digits, | Difficulty: 700-Level, Divisibility/Multiples/Factors, Fractions/Ratios/Decimals, Source: Other - Please specify | | 55 | Is y^2 + 7y + xy even? | Difficulty: 700-Level, Divisibility/Multiples/Factors, Number Properties | | 56 | For positive integers n and m (n>m), is the average (arithmetic mean) | Difficulty: 700-Level, Number Properties, Statistics and Sets Problems, Source: Math Revolution | | 57 | If a and b are positive integers, what is the remainder when ab is | Difficulty: 700-Level, Divisibility/Multiples/Factors, Number Properties, Remainders, Source: Manhattan GMAT | | 58 | Between 1980 and 1985, Pierre’s investment portfolio increas | Difficulty: 700-Level, Percent and Interest Problems, Source: Princeton Review | | 59 | Superfast train A leaves Newcastle for Birmingham at 3 PM and travels | Difficulty: 700-Level, Distance/Rate Problems, Source: Veritas Prep | | 60 | If x is a positive integer less than 100 such that x is | Difficulty: 700-Level, Algebra, Exponents/Powers, Source: e-GMAT | | 61 | A certain ride has 60 people standing in line awaiting admission. If | Difficulty: 700-Level, Overlapping Sets, Source: Other - Please specify | | 62 | If n >2 and n^4-5n^2+4 = 20h, Is h an integer ? | Difficulty: 700-Level, Algebra, Arithmetic, Source: Other - Please specify | | 63 | If x and y are non zero numbers less than 1, is (y^4 − x^4) > (y^3 − x | Difficulty: 700-Level, Inequalities, Source: Jamboree | | 64 | If x, y, and z are integers, and x < y < z, is z y = y | Difficulty: 700-Level, Statistics and Sets Problems, Source: Manhattan GMAT | | 65 | In the correctly-worked multiplication problem above, each symbol repr | Difficulty: 700-Level, Arithmetic, Number Properties, Source: Veritas Prep | | 66 | If x and y are integers and -x < y < x, does (x^2 - y^2)^(1/2) = x + y | Difficulty: 700-Level, Absolute Values/Modulus, Algebra, Coordinate Geometry, Number Properties, Source: GMAT Club Tests | | 67 | Students in a class are arranged to form groups of 4 members each | Difficulty: 700-Level, Remainders, Source: Veritas Prep | | 68 | Is |2a − 3b| < |a − b| + |a − 2b| | Difficulty: 700-Level, Absolute Values/Modulus | | 69 | If a, b, and c are integers such that 0 < a < b < c < 10, is | Difficulty: 700-Level, Divisibility/Multiples/Factors, Source: Manhattan GMAT | | 70 | What is b in the circle shown above? (1) bc = 5a (2) The length of PQ | Difficulty: 700-Level, Geometry, Source: Other - Please specify | | 71 | a, b, and c are three integers such that a and b are less than 100, an | Difficulty: 700-Level, Number Properties, Sequences | | 72 | How many prime factors does positive integer n have? | Difficulty: 700-Level, Number Properties, Source: Veritas Prep | | 73 | In the number 13,52#,@ and # represent distinct digits. | Difficulty: 700-Level, Arithmetic, Divisibility/Multiples/Factors, Source: Princeton Review | | 74 | If the given addition is correct, what is the sum of T, U and V? | Difficulty: 700-Level, Algebra, Source: Other - Please specify | | 75 | Set X consists of 9 positive elements. Set Y consists of the | Difficulty: 700-Level, Statistics and Sets Problems | | 76 | Reiko drove from point A to point B at a constant speed, and | Difficulty: 700-Level, Distance/Rate Problems, Source: Manhattan GMAT | | 77 | In the morning, Chris drives from Toronto to Oakville and in the eveni | Difficulty: 700-Level, Distance/Rate Problems, Source: Veritas Prep | | 78 | Points A, B, C and D lie on a circle of radius 1. Let x be | Difficulty: 700-Level, Geometry | | 79 | X is a three-digit positive integer in which each digit is either 1 or | Difficulty: 700-Level, Fractions/Ratios/Decimals, Remainders, Source: Manhattan GMAT | | 80 | At a particular store, candy bars are normally priced at $1. | Difficulty: 700-Level, Word Problems, Source: Manhattan GMAT | | 81 | If a and b are both positive integers, is b^(a+1) - ba^b odd? | Difficulty: 700-Level, Algebra, Number Properties, Source: Manhattan GMAT | | 82 | If x and y are positive integers, what is the value of x? | Difficulty: 700-Level, Remainders, Source: GMATPrepNow | | 83 | When a positive integer 'x' is divided by a divisor 'd', the remainder | Difficulty: 700-Level, Divisibility/Multiples/Factors, Remainders, Source: Other - Please specify | | 84 | Is the integer 2b divisible by 6 ? | Difficulty: 700-Level, Divisibility/Multiples/Factors | | 85 | A drawer contains 6 socks. If two socks are randomly | Difficulty: 700-Level, Probability, Source: GMATPrepNow | | 86 | The nth term of an increasing sequence S is given by Sn = Sn-1 + Sn-2 | Difficulty: 700-Level, Algebra, Sequences | | 87 | w, x, y and z are positive integers such that y < z < x < w. | Difficulty: 700-Level, Remainders, Source: GMATPrepNow | | 88 | If x, y, and k are positive integers, is k < 10 ? | Difficulty: 700-Level, Algebra, Exponents/Powers, Roots, Source: Princeton Review | | 89 | How many subordinates does Marcia have? | Difficulty: 700-Level, Combinations | | 90 | A committee of 2 people is to be formed from a group of 8 | Difficulty: 700-Level, Probability | | 91 | If x and y are negative numbers, is x<y? | Difficulty: 700-Level, Inequalities, Source: GMAT Club Tests | | 92 | In the xy-coordinate plane, line L passes through the points (b, a) an | Difficulty: 700-Level, Coordinate Geometry, Source: Manhattan GMAT | | 93 | In the xy-coordinate plane, line A is defined by the equation j*x-y=-7 | Difficulty: 700-Level, Coordinate Geometry, Source: GMAT Prep | | 94 | A certain salesman's yearly income is determined by a base salary plus | Difficulty: 700-Level, Percent and Interest Problems, Word Problems, Source: Manhattan GMAT | | 95 | Is A + B + C even? | Difficulty: 700-Level, Number Properties, Source: GMAT Club Tests | | 96 | If m, n, and p are three-digit integers and m + n = p | Difficulty: 700-Level, Number Properties, Source: Manhattan GMAT | | 97 | If x is an integer between 0 and 10 is y less than the average of x an | Difficulty: 700-Level, Inequalities, Source: Other - Please specify | | 98 | If x/y > 2, is 3x + 2y < 18? (1) x - y is less than 2 (2) y - x is les | Difficulty: 700-Level, Inequalities | | 99 | If x is a positive integer greater than 1, is x a prime numb | Difficulty: 700-Level, Divisibility/Multiples/Factors, Number Properties, Source: GMAT Club Tests | | 100 | If N is a positive three-digit number that is greater than 2 | Difficulty: 700-Level, Fractions/Ratios/Decimals, Number Properties, Source: Manhattan GMAT |
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Originally posted by Bunuel on 21 Aug 2015, 03:42.
Last edited by Bunuel on 01 Jan 2020, 05:45, edited 1 time in total.
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Math Expert
Joined: 02 Sep 2009
Posts: 60480
|
Re: 100 Hardest and easiest questions for DS
[#permalink]
Show Tags
Updated on: 01 Jan 2020, 05:45
100 Easiest Data Sufficiency Questions (Dec 1st, 2019 - Jan 1st, 2020) Are you familiar with the GMAT Club's timer?We have pulled timer results from our database and analyzed every question in the forum. Based on those results, we have compiled a list of the easiest questions in each of the question forums we have. Below I am presenting to you the top 100 questions from DS forum. | Data Sufficiency (DS) | | Rank | Title | Topics | | 1 | If a certain vase contains only roses and tulips, how many tulips are | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 2 | What is the value of 10 percent of y? | Difficulty: Sub-600 Level, Percent and Interest Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 3 | What is the number of pages of a certain journal article? The size of | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 4 | In a recent town election, what was the ratio of the number of votes | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 5 | What is the value of x ? | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: Quant Review 2nd | | 6 | In College X the number of students enrolled in both a | Difficulty: Sub-600 Level, Overlapping Sets, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 2017, Source: OG 2016, Source: OG 2015, Source: OG 12 | | 7 | How many basic units of currency X are equivalent to 250 basi | Difficulty: Sub-600 Level, Arithmetic, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 8 | For which type of investment, J or K, is the annual rate of | Difficulty: Sub-600 Level, Percent and Interest Problems, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 2015, Source: OG 12 | | 9 | What was the median annual salary for the employees at Compan | Difficulty: Sub-600 Level, Statistics and Sets Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 10 | The symbol R represents one of the following | Difficulty: Sub-600 Level, Arithmetic, Functions and Custom Characters, Source: GMAT Hacks | | 11 | If p and q are positive, is p/q less than 1? | Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 | | 12 | The research funds of a certain company were divided among three depar | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 13 | If sequence S has 120 terms, what is the 105th term of S? | Difficulty: Sub-600 Level, Sequences, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 14 | If sequence S has 100 terms, what is the 83rd term of S? | Difficulty: Sub-600 Level, Sequences, Source: Other - Please specify | | 15 | What is the value of x ? | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 | | 16 | Is x = 1/y? | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 17 | What is the tenths digit of the number d when it is written as a...... | Difficulty: Sub-600 Level, Fractions/Ratios/Decimals, Source: Official Guide, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 | | 18 | What is the value of n? | Difficulty: Sub-600 Level, Number Properties, Source: GMAT Prep | | 19 | The figure above represents a circle graph of Company H's total expens | Difficulty: Sub-600 Level, Geometry, Graphs and Illustrations, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015, Source: OG 12, Source: OG 11 | | 20 | What is the value of w^(−2)? | Difficulty: Sub-600 Level, Exponents/Powers, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 21 | If r and s are positive integers, is r + s even? | Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: OG 2020 | | 22 | If p, q, x, y, and z are different positive integers, which | Difficulty: Sub-600 Level, Statistics and Sets Problems, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st | | 23 | What is the value of xy? | Difficulty: Sub-600 Level, Algebra, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st | | 24 | Each of the marbles in a jar is either red or white or blue. If one ma | Difficulty: Sub-600 Level, Probability, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 25 | In the xy-plane above, is angle QPR a right angle? | Difficulty: Sub-600 Level, Coordinate Geometry, Geometry, Source: Official Guide, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 | | 26 | Is p^2 an odd integer? | Difficulty: Sub-600 Level, Number Properties, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st | | 27 | Carlotta can drive from her home to her office by one of two | Difficulty: Sub-600 Level, Distance/Rate Problems, Source: Official Guide, Source: OG 12, Source: OG 11, Source: OG 10 | | 28 | What is the perimeter of triangle ABC ? (1) AB = 16 inches (2) ABC is | Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: Quant Review 2020 | | 29 | What is 11% of x? (1) 3/8 of x is 24 (2) 5% of x is 3.2 | Difficulty: Sub-600 Level, Arithmetic, Percent and Interest Problems, Source: Manhattan GMAT | | 30 | How many of the students in a certain class are taking both a history | Difficulty: Sub-600 Level, Number Properties, Word Problems, Source: GMAT Prep | | 31 | What is the value of r/2 + s/2 ? | Difficulty: Sub-600 Level, Algebra, Arithmetic, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st | | 32 | A company bought 3 printers and 1 scanner. What was the price of the | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 33 | Committee member W wants to schedule a one-hour meeting on T | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st | | 34 | Is rw = 0? | Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 35 | Is x between 0 and 1? (1) x is between -1/2 and 3/2 (2) 3/4 is 1/4 | Difficulty: Sub-600 Level, Inequalities, Source: GMAT Prep, Source: Quant Review 2020, Source: Quant Review 2019 | | 36 | Hoses X and Y simultaneously fill an empty swimming pool tha | Difficulty: Sub-600 Level, Work/Rate Problems, Source: Official Guide, Source: OG 10, Source: Quant Review 2nd, Source: Quant Review 1st | | 37 | Is 2x > 2y ? | Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 | | 38 | What is the value of n in the list above? | Difficulty: Sub-600 Level, Statistics and Sets Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 | | 39 | Is x < y? | Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2nd | | 40 | What is the retail price of a certain calculator? (1) The retail pri | Difficulty: Sub-600 Level, Arithmetic, Source: Manhattan GMAT | | 41 | Machine R and machine S work at their respective constant rates. How | Difficulty: Sub-600 Level, Work/Rate Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 42 | Does 2x + 8 = 12 ? (1) 2x + 10 = 14 (2) 3x + 8 = 14 | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019 | | 43 | How many men are in a certain company's vanpool program? | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 44 | If sequence S has 200 terms, what is the 192nd term of S | Difficulty: Sub-600 Level, Sequences, Source: OG 12 | | 45 | How many people in a group of 50 own neither a fax machine nor a laser | Difficulty: Sub-600 Level, Overlapping Sets, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 46 | Is x < y? (1) z < y (2) z < x | Difficulty: Sub-600 Level, Inequalities, Source: GMAT Paper Tests, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 1st | | 47 | If n is an integer, is n + 1 odd? | Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: OG 2016, Source: OG 2015, Source: OG 12, Source: OG 11 | | 48 | For the system of equations given, what is the value of z? | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2015, Source: OG 12, Source: OG 11 | | 49 | What is the product of v, w, and x? | Difficulty: Sub-600 Level, Number Properties | | 50 | For all x, the expression x* is defined to be ax + a, where a is...... | Difficulty: Sub-600 Level, Functions and Custom Characters, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 | | 51 | In a certain class, some students donated cans of food to a local food | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 52 | A circular pizza is cut into eight wedge-shaped slices of equal size. | Difficulty: Sub-600 Level, Geometry, Source: Manhattan GMAT | | 53 | In the terminating decimal equivalent of d, what is the number of nonz | Difficulty: Sub-600 Level, Fractions/Ratios/Decimals, Number Properties, Source: Other - Please specify | | 54 | What is the greatest integer that is less than t? | Difficulty: Sub-600 Level, Number Properties, Source: GMAT Prep | | 55 | If the Longfellow Playground is rectangular, what is its width? | Difficulty: Sub-600 Level, Geometry, Source: Official Guide [Pre-2000], Source: OG 1988 | | 56 | If knz≠0, what is the ratio of k to n? 1) The ratio of k to z is 2 to | Difficulty: Sub-600 Level, Fractions/Ratios/Decimals, Source: Math Revolution | | 57 | Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2) | Difficulty: Sub-600 Level, Algebra, Number Properties, Source: Official Guide, Source: OG 2020 | | 58 | A garden store purchased a number of shovels and a number of rakes. If | Difficulty: Sub-600 Level, Word Problems, Source: GMAT Prep | | 59 | What is the value of w + q ? (1) 3w=3-3q (2) 5w +5q = 5 | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 | | 60 | The number of seats in the first row of an auditorium is 18 | Difficulty: Sub-600 Level, Sequences, Source: Official Guide, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015 | | 61 | In the figure above, segments PQ and PR are each parallel to one of th | Difficulty: Sub-600 Level, Coordinate Geometry, Source: GMAT Prep | | 62 | What is the value of x^3? | Difficulty: Sub-600 Level, Absolute Values/Modulus, Algebra, Source: Veritas Prep | | 63 | The cost of 10 pounds of apples and 2 pounds of grapes was $1 | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 64 | Square ABCD is inscribed in circle O. What is the area of square regio | Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 65 | Is the integer p even? (1) The integer p^2 + 1 is odd. (2) The integer | Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019 | | 66 | P is a particle on the circle shown above. What is the length of the p | Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: Quant Review 2020 | | 67 | If x is positive, what is the value of y ? | Difficulty: Sub-600 Level, Algebra, Source: GMAT Prep | | 68 | If R, S, and T are points on a line, and if R is 5 meters from T and 2 | Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2020 | | 69 | On a map, 1/2 inch represents 100 miles. According to this map, how ma | Difficulty: Sub-600 Level, Arithmetic, Source: Official Guide, Source: OG 2020 | | 70 | What is the volume of the cube above? | Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 | | 71 | What is the value of x−1? | Difficulty: Sub-600 Level, Algebra, Source: Official Guide [Pre-2000], Source: OG 1988, Source: Other - Please specify | | 72 | Was the amount of John's heating bill for February greater than it was | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 73 | What was the range of the selling prices of the 30 wallets sold by a | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016 | | 74 | What is the volume of a certain cube? | Difficulty: Sub-600 Level, Geometry, Source: GMAT Prep | | 75 | Point (x, y) has in which quadrant of the rectangular coordinate syste | Difficulty: Sub-600 Level, Coordinate Geometry, Source: GMAT Paper Tests, Source: Magoosh, Source: OG 10, Source: Quant Review 1st | | 76 | What is the value of ab + bc ? (1) b = 5 (2) a + c = 8 | Difficulty: Sub-600 Level, Algebra, Source: Grockit | | 77 | In the figure above, what is the value of z? | Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017 | | 78 | Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 | Difficulty: Sub-600 Level, Algebra, Source: GMAT Paper Tests | | 79 | What is the value of the integer N? | Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2020, Source: Quant Review 2019, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016 | | 80 | Bob purchased 18 cans of soda, some of which contained diet soda. How | Difficulty: Sub-600 Level, Word Problems, Source: Princeton Review | | 81 | What is the value of z in the triangle above? | Difficulty: Sub-600 Level, Geometry, Source: Official Guide, Source: OG 2015, Source: OG 12, Source: OG 11, Source: OG 10 | | 82 | What is the value of t? | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017 | | 83 | P is a particle on the circle shown above. What is the length of the p | Difficulty: Sub-600 Level, Geometry, Source: Official Guide [Pre-2000] | | 84 | What is the average distance that automobile D travels on one full tan | Difficulty: Sub-600 Level, Algebra, Word Problems, Source: Official Guide [Pre-2000], Source: OG 1988 | | 85 | What was Bill's average speed on his trip of 250 miles from New York | Difficulty: Sub-600 Level, Distance/Rate Problems, Source: Manhattan GMAT | | 86 | If u, v, and w are integers, is u > 0 ? | Difficulty: Sub-600 Level, Algebra, Source: GMAT Prep | | 87 | What is the value of x? (1) |x| = 4. (2) x^2 = 16. | Difficulty: Sub-600 Level, Absolute Values/Modulus, Algebra, Source: Princeton Review | | 88 | What is the value of xy ? | Difficulty: Sub-600 Level, Algebra, Source: GMAT Hacks | | 89 | What is the value of x? (1) 5x - 3 = 7 (2) x/10 = 1/5 | Difficulty: Sub-600 Level, Algebra, Source: Official Guide [Pre-2000], Source: OG 1988 | | 90 | What were the gross revenues from ticket sales for a certain | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 10, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st | | 91 | Water is pumped into a partially filled tank at a constant | Difficulty: Sub-600 Level, Work/Rate Problems, Source: Official Guide, Source: OG 2018, Source: OG 2017, Source: OG 2016, Source: OG 2015, Source: OG 12, Source: OG 11 | | 92 | If a + b + c = 12, what is the value of b? (1) a + b = 8 (2) b + c = 6 | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 2020, Source: OG 2019 | | 93 | If x and y are integers, what is the value of y ? | Difficulty: Sub-600 Level, Algebra, Source: Official Guide, Source: OG 10, Source: Quant Review 2017, Source: Quant Review 2016, Source: Quant Review 2nd, Source: Quant Review 1st | | 94 | If a school district paid a total of $35 per desk for x desks and a to | Difficulty: Sub-600 Level, Word Problems, Source: Official Guide, Source: OG 2020 | | 95 | If x and y are integers, what is the value of x+y? | Difficulty: Sub-600 Level, Inequalities, Source: GMAT Prep | | 96 | If machine X ran continuously at a uniform rate to fill | Difficulty: Sub-600 Level, Work/Rate Problems | | 97 | Is m > k? (1) 3m > 3k (2) 2m > 2k | Difficulty: Sub-600 Level, Inequalities, Source: GMAT Prep | | 98 | Is x a negative number? | Difficulty: Sub-600 Level, Inequalities, Source: Official Guide, Source: OG 2015, Source: OG 12, Source: OG 11, Source: OG 10 | | 99 | Q is a cube. Find the volume of the cube. | Difficulty: Sub-600 Level, Geometry, Source: Magoosh | | 100 | Is w + h^4 positive? (1) h is positive (2) w is positive | Difficulty: Sub-600 Level, Number Properties, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017 |
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Originally posted by Bunuel on 21 Aug 2015, 03:43.
Last edited by Bunuel on 01 Jan 2020, 05:45, edited 1 time in total.
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Math Expert
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Re: 100 Hardest and easiest questions for DS
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21 Aug 2015, 05:20
Older version of this topic with 100 hardest questions is HERE.
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Re: 100 Hardest and easiest questions for DS
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07 Dec 2015, 09:09
is there a dump of all these questions rather than click each link?
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Re: 100 Hardest and easiest questions for DS
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09 Jun 2017, 07:33
is there a dump of all these questions rather than click each link? Bunuel IF not can you please make one as Its very time consuming due to technical problem thanks!!
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Re: 100 Hardest and easiest questions for DS
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29 Jun 2017, 21:33
This is very helpful. Thank you very much for your efforts. You are doing a great service to those who aspire to ace GMAT. Keep up the good work.
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Re: 100 Hardest and easiest questions for DS
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29 Jun 2017, 21:57
Thanks Buñuel for your efforts.[WHITE SMILING FACE] Sent from my Moto G Play using GMAT Club Forum mobile app
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100 Hardest and easiest questions for DS
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24 Aug 2017, 21:55
Hi Bunuel , Thanks for the sharing the list of questions. Do we anywhere have the option to download all the questions in one go or we have to access them separately only. Thanks!
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Re: 100 Hardest and easiest questions for DS
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24 Aug 2017, 21:58
2201neha wrote: Hi Bunuel , Thanks for the sharing the list of questions. Do we anywhere have the option to download all the questions in one go or we have to access them separately only. Thanks! The list is regularly updated so there is no downloadable file.
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Re: 100 Hardest and easiest questions for DS
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29 Jan 2018, 23:02
Hi Bunuel This is extremely helpful, many thanks 
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Re: 100 Hardest and easiest questions for DS
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30 May 2018, 09:57
answer choices are not showing. Could anyone let me know to view the answers.
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Re: 100 Hardest and easiest questions for DS
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30 May 2018, 22:47
SoloKOW wrote: answer choices are not showing. Could anyone let me know to view the answers. Click Spoiler: OA in the first post of a topic to check the official answer.
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Re: 100 Hardest and easiest questions for DS as of August 2019
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02 Sep 2019, 20:59
chondro48 wrote: Bunuel, Can any question in the Hardest Data Sufficiency Questions as of August 2019 appear in the same list as of July 2019, or earlier month and year? Thanks for clarifying. Posted from my mobile device Yes. Even though the list is updated once a month, many questions in top remain the same.
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100 Hardest and easiest questions for DS as of August 2019
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04 Sep 2019, 17:59
Hi bbIs there any way for a user to search questions by the level of difficulty (e.g. 85% above) in this forum? I know the difficulty level is generated by an unofficial algorithm, but I feel that the computed level is pretty much reliable indicator.
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Re: 100 Hardest and easiest questions for DS as of August 2019
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05 Sep 2019, 03:06
chondro48 wrote: Hi bbIs there any way for a user to search questions by the level of difficulty (e.g. 85% above) in this forum? I know the difficulty level is generated by an unofficial algorithm, but I feel that the computed level is pretty much reliable indicator. There are 3 difficulties that are available for search. That’s how the system works - hard, medium, and easy. https://gmatclub.com/forum/search.php?view=search_tagsPosted from my mobile device
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Re: 100 Hardest and easiest questions for DS as of August 2019
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05 Sep 2019, 03:06
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