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Joined: 02 Sep 2009
Posts: 60480

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: 700Level, Distance/Rate Problems  2  What is the perimeter of PQRS ? (1) x = 30 degree (2) w= 45 degree  Difficulty: 700Level, Geometry  3  In the correctly worked addition problem above, A, B, C, D  Difficulty: 700Level, 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: 700Level, Divisibility/Multiples/Factors, Number Properties, Source: Manhattan GMAT  5  A car dealership carries only sedans and SUVs  Difficulty: 700Level, Percent and Interest Problems, Word Problems, Source: Veritas Prep  6  If n is a prime number greater than 2, is 1/x > 1?  Difficulty: 700Level, Exponents/Powers, Inequalities, Source: Manhattan GMAT  7  n and k are positive integers. When n is divided by 23, the quotient i  Difficulty: 700Level, Remainders, Source: GMATPrepNow  8  If k is an integer and x(x â€“ k) = k + 1, what is the value of x?  Difficulty: 700Level, Algebra, Source: Other  Please specify  9  If all the N students of a class are classified into groups of either  Difficulty: 700Level, Divisibility/Multiples/Factors, Number Properties, Source: eGMAT  10  If, in the addition problem above, a, b, c, d, e, f, x, y, a  Difficulty: 700Level, Arithmetic  11  For integers a and b, if (a^3 a^2 b)^1/2 = 7, what is the  Difficulty: 700Level, Algebra  12  When 120 is divided by positive singledigit integer m the remainder  Difficulty: 700Level, 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: 700Level, Word Problems, Source: 800 Score  14  The average (arithmetic mean) of 5 distinct, single digit integers is  Difficulty: 700Level, Number Properties, Source: Princeton Review  15  The cost of 3 chocolates, 5 biscuits, and 5 ice creams is  Difficulty: 700Level, Word Problems  16  Right triangle ABO is drawn in the xyplane, with OB as hypo  Difficulty: 700Level, Geometry, Source: Manhattan GMAT  17  Abe, Beth, Carl and Duncan are four siblings, among which Abe and Carl  Difficulty: 700Level, Number Properties, Source: eGMAT  18  If h and k are both positive integers, are both roots of the equation  Difficulty: 700Level, Algebra  19  If 20 Swiss Francs is enough to buy 9 notebooks and 3 pencils, is 40  Difficulty: 700Level, Inequalities, Word Problems  20  There is a sequence, 4(10^n), 4(10^(n1)), ..., 4(10^(nm)), for posit  Difficulty: 700Level, 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: 700Level, Number Properties, Source: eGMAT  22  A red box contains 7 ropes, with an average length of 60 cm per rope,  Difficulty: 700Level, Arithmetic, Min/Max Problems, Source: Other  Please specify  23  If x, y, and z are all distinct positive integers and the percent  Difficulty: 700Level, 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: 700Level, Word Problems, Source: Veritas Prep  25  W, X, Y, and Z represent distinct digits such that WX * YZ = 1995. Wha  Difficulty: 700Level, Number Properties, Source: Veritas Prep  26  A cube is made up of equal smaller cubes. Two of the sides  Difficulty: 700Level, Geometry  27  If a, b, and c are positive integers such that 1/a + 1/b = 1  Difficulty: 700Level, Fractions/Ratios/Decimals, Inequalities, Source: Manhattan GMAT  28  A newer machine, working alone at its constant rate  Difficulty: 700Level, Work/Rate Problems, Source: Veritas Prep  29  What is b in the circle shown above?  Difficulty: 700Level, Geometry, Source: Other  Please specify  30  Three employees, A, B and C, clean a certain conference room each day.  Difficulty: 700Level, Work/Rate Problems, Source: Other  Please specify  31  The number of elements in set K is an odd number. The minimum value of  Difficulty: 700Level, 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: 700Level, 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: 700Level, Statistics and Sets Problems  34  The numbers D, N, and P are positive integers, such that D < N, and N  Difficulty: 700Level, Exponents/Powers, Number Properties, Source: Magoosh  35  w, x, y, and z are integers. If z > y > x > w, is w > x^2  Difficulty: 700Level, Absolute Values/Modulus, Inequalities, Source: Kaplan  36  A natural number p, when divided by a certain divisor q, gives  Difficulty: 700Level, Number Properties, Remainders, Source: Jamboree  37  In the picture, quadrilateral ABCD is a parallelogram and  Difficulty: 700Level, Geometry  38  At a restaurant, a group of friends ordered four main dishes  Difficulty: 700Level, Min/Max Problems, Source: Manhattan GMAT  39  If x, y and z are positive integers such that x^4*y^3 = z^2  Difficulty: 700Level, Number Properties, Source: eGMAT  40  Maria drove a distance without stopping such that she covered first  Difficulty: 700Level, Distance/Rate Problems, Source: Other  Please specify  41  There are N men in a group. Their average age is 20 years. Find N.  Difficulty: 700Level, Statistics and Sets Problems, Source: Other  Please specify  42  If x is positive, what is the value of x â€“ 3 â€“ 2x â€“ 4 +  Difficulty: 700Level, Absolute Values/Modulus, Inequalities, Source: Manhattan GMAT  43  A three digit number A with hundreds digit a, tens digit b and units  Difficulty: 700Level, Divisibility/Multiples/Factors, Number Properties, Source: Jamboree  44  Is 1/(xy) < y  x  Difficulty: 700Level, Inequalities  45  If a, b, x, y are positive integers and a^xb^y= 144, then a + b = ?  Difficulty: 700Level, Algebra, Exponents/Powers, Source: Math Revolution  46  Is x^3  6x^2 + 11x  6 < 0  Difficulty: 700Level, Inequalities  47  Is a  3b an even number?  Difficulty: 700Level, Number Properties  48  In a sequence of 13 consecutive integers, all of which are  Difficulty: 700Level, Divisibility/Multiples/Factors, Sequences  49  The area of a rectangle is 28 square centimeter. What is the perimeter  Difficulty: 700Level, Algebra, Geometry  50  A set of positive integers contains twice as many even integers as odd  Difficulty: 700Level, Divisibility/Multiples/Factors, Number Properties, Probability  51  x, y are positive integers. Find the number of even factors of 4x^2  Difficulty: 700Level, Divisibility/Multiples/Factors, Source: eGMAT  52  In a group of 80 college students, how many own a car?  Difficulty: 700Level, Overlapping Sets, Source: Magoosh  53  If a and b are twodigit positive integers greater than 10  Difficulty: 700Level, Remainders, Source: GMAT Club Tests  54  If pqr s is a fourdigit number, where p, q, r and s are the digits,  Difficulty: 700Level, Divisibility/Multiples/Factors, Fractions/Ratios/Decimals, Source: Other  Please specify  55  Is y^2 + 7y + xy even?  Difficulty: 700Level, Divisibility/Multiples/Factors, Number Properties  56  For positive integers n and m (n>m), is the average (arithmetic mean)  Difficulty: 700Level, 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: 700Level, Divisibility/Multiples/Factors, Number Properties, Remainders, Source: Manhattan GMAT  58  Between 1980 and 1985, Pierreâ€™s investment portfolio increas  Difficulty: 700Level, Percent and Interest Problems, Source: Princeton Review  59  Superfast train A leaves Newcastle for Birmingham at 3 PM and travels  Difficulty: 700Level, Distance/Rate Problems, Source: Veritas Prep  60  If x is a positive integer less than 100 such that x is  Difficulty: 700Level, Algebra, Exponents/Powers, Source: eGMAT  61  A certain ride has 60 people standing in line awaiting admission. If  Difficulty: 700Level, Overlapping Sets, Source: Other  Please specify  62  If n >2 and n^45n^2+4 = 20h, Is h an integer ?  Difficulty: 700Level, Algebra, Arithmetic, Source: Other  Please specify  63  If x and y are non zero numbers less than 1, is (y^4 âˆ’ x^4) > (y^3 âˆ’ x  Difficulty: 700Level, Inequalities, Source: Jamboree  64  If x, y, and z are integers, and x < y < z, is z y = y  Difficulty: 700Level, Statistics and Sets Problems, Source: Manhattan GMAT  65  In the correctlyworked multiplication problem above, each symbol repr  Difficulty: 700Level, 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: 700Level, 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: 700Level, Remainders, Source: Veritas Prep  68  Is 2a âˆ’ 3b < a âˆ’ b + a âˆ’ 2b  Difficulty: 700Level, Absolute Values/Modulus  69  If a, b, and c are integers such that 0 < a < b < c < 10, is  Difficulty: 700Level, Divisibility/Multiples/Factors, Source: Manhattan GMAT  70  What is b in the circle shown above? (1) bc = 5a (2) The length of PQ  Difficulty: 700Level, Geometry, Source: Other  Please specify  71  a, b, and c are three integers such that a and b are less than 100, an  Difficulty: 700Level, Number Properties, Sequences  72  How many prime factors does positive integer n have?  Difficulty: 700Level, Number Properties, Source: Veritas Prep  73  In the number 13,52#,@ and # represent distinct digits.  Difficulty: 700Level, Arithmetic, Divisibility/Multiples/Factors, Source: Princeton Review  74  If the given addition is correct, what is the sum of T, U and V?  Difficulty: 700Level, Algebra, Source: Other  Please specify  75  Set X consists of 9 positive elements. Set Y consists of the  Difficulty: 700Level, Statistics and Sets Problems  76  Reiko drove from point A to point B at a constant speed, and  Difficulty: 700Level, Distance/Rate Problems, Source: Manhattan GMAT  77  In the morning, Chris drives from Toronto to Oakville and in the eveni  Difficulty: 700Level, Distance/Rate Problems, Source: Veritas Prep  78  Points A, B, C and D lie on a circle of radius 1. Let x be  Difficulty: 700Level, Geometry  79  X is a threedigit positive integer in which each digit is either 1 or  Difficulty: 700Level, Fractions/Ratios/Decimals, Remainders, Source: Manhattan GMAT  80  At a particular store, candy bars are normally priced at $1.  Difficulty: 700Level, Word Problems, Source: Manhattan GMAT  81  If a and b are both positive integers, is b^(a+1)  ba^b odd?  Difficulty: 700Level, Algebra, Number Properties, Source: Manhattan GMAT  82  If x and y are positive integers, what is the value of x?  Difficulty: 700Level, Remainders, Source: GMATPrepNow  83  When a positive integer 'x' is divided by a divisor 'd', the remainder  Difficulty: 700Level, Divisibility/Multiples/Factors, Remainders, Source: Other  Please specify  84  Is the integer 2b divisible by 6 ?  Difficulty: 700Level, Divisibility/Multiples/Factors  85  A drawer contains 6 socks. If two socks are randomly  Difficulty: 700Level, Probability, Source: GMATPrepNow  86  The nth term of an increasing sequence S is given by Sn = Sn1 + Sn2  Difficulty: 700Level, Algebra, Sequences  87  w, x, y and z are positive integers such that y < z < x < w.  Difficulty: 700Level, Remainders, Source: GMATPrepNow  88  If x, y, and k are positive integers, is k < 10 ?  Difficulty: 700Level, Algebra, Exponents/Powers, Roots, Source: Princeton Review  89  How many subordinates does Marcia have?  Difficulty: 700Level, Combinations  90  A committee of 2 people is to be formed from a group of 8  Difficulty: 700Level, Probability  91  If x and y are negative numbers, is x<y?  Difficulty: 700Level, Inequalities, Source: GMAT Club Tests  92  In the xycoordinate plane, line L passes through the points (b, a) an  Difficulty: 700Level, Coordinate Geometry, Source: Manhattan GMAT  93  In the xycoordinate plane, line A is defined by the equation j*xy=7  Difficulty: 700Level, Coordinate Geometry, Source: GMAT Prep  94  A certain salesman's yearly income is determined by a base salary plus  Difficulty: 700Level, Percent and Interest Problems, Word Problems, Source: Manhattan GMAT  95  Is A + B + C even?  Difficulty: 700Level, Number Properties, Source: GMAT Club Tests  96  If m, n, and p are threedigit integers and m + n = p  Difficulty: 700Level, 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: 700Level, 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: 700Level, Inequalities  99  If x is a positive integer greater than 1, is x a prime numb  Difficulty: 700Level, Divisibility/Multiples/Factors, Number Properties, Source: GMAT Club Tests  100  If N is a positive threedigit number that is greater than 2  Difficulty: 700Level, Fractions/Ratios/Decimals, Number Properties, Source: Manhattan GMAT 
_________________
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.




Math Expert
Joined: 02 Sep 2009
Posts: 60480

Re: 100 Hardest and easiest questions for DS
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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: Sub600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019  2  What is the value of 10 percent of y?  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019  5  What is the value of x ?  Difficulty: Sub600 Level, Algebra, Source: Official Guide, Source: Quant Review 2nd  6  In College X the number of students enrolled in both a  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Statistics and Sets Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019  10  The symbol R represents one of the following  Difficulty: Sub600 Level, Arithmetic, Functions and Custom Characters, Source: GMAT Hacks  11  If p and q are positive, is p/q less than 1?  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Sequences, Source: Other  Please specify  15  What is the value of x ?  Difficulty: Sub600 Level, Algebra, Source: Official Guide, Source: Quant Review 2018, Source: Quant Review 2017, Source: Quant Review 2016  16  Is x = 1/y?  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Number Properties, Source: GMAT Prep  19  The figure above represents a circle graph of Company H's total expens  Difficulty: Sub600 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^(âˆ’2)?  Difficulty: Sub600 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: Sub600 Level, Number Properties, Source: Official Guide, Source: OG 2020  22  If p, q, x, y, and z are different positive integers, which  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Probability, Source: Official Guide, Source: OG 2020, Source: OG 2019, Source: OG 2018, Source: OG 2017, Source: OG 2016  25  In the xyplane above, is angle QPR a right angle?  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Number Properties, Word Problems, Source: GMAT Prep  31  What is the value of r/2 + s/2 ?  Difficulty: Sub600 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: Sub600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019  33  Committee member W wants to schedule a onehour meeting on T  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Work/Rate Problems, Source: Official Guide, Source: OG 10, Source: Quant Review 2nd, Source: Quant Review 1st  37  Is 2x > 2y ?  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Inequalities, Source: Official Guide, Source: Quant Review 2nd  40  What is the retail price of a certain calculator? (1) The retail pri  Difficulty: Sub600 Level, Arithmetic, Source: Manhattan GMAT  41  Machine R and machine S work at their respective constant rates. How  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Sequences, Source: OG 12  45  How many people in a group of 50 own neither a fax machine nor a laser  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Number Properties  50  For all x, the expression x* is defined to be ax + a, where a is......  Difficulty: Sub600 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: Sub600 Level, Word Problems, Source: Official Guide, Source: OG 2020, Source: OG 2019  52  A circular pizza is cut into eight wedgeshaped slices of equal size.  Difficulty: Sub600 Level, Geometry, Source: Manhattan GMAT  53  In the terminating decimal equivalent of d, what is the number of nonz  Difficulty: Sub600 Level, Fractions/Ratios/Decimals, Number Properties, Source: Other  Please specify  54  What is the greatest integer that is less than t?  Difficulty: Sub600 Level, Number Properties, Source: GMAT Prep  55  If the Longfellow Playground is rectangular, what is its width?  Difficulty: Sub600 Level, Geometry, Source: Official Guide [Pre2000], Source: OG 1988  56  If knzâ‰ 0, what is the ratio of k to n? 1) The ratio of k to z is 2 to  Difficulty: Sub600 Level, Fractions/Ratios/Decimals, Source: Math Revolution  57  Is x an integer? (1) x^3 = 8 (2) x = 4^(1/2)  Difficulty: Sub600 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: Sub600 Level, Word Problems, Source: GMAT Prep  59  What is the value of w + q ? (1) 3w=33q (2) 5w +5q = 5  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Coordinate Geometry, Source: GMAT Prep  62  What is the value of x^3?  Difficulty: Sub600 Level, Absolute Values/Modulus, Algebra, Source: Veritas Prep  63  The cost of 10 pounds of apples and 2 pounds of grapes was $1  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Geometry, Source: Official Guide, Source: Quant Review 2020  67  If x is positive, what is the value of y ?  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Arithmetic, Source: Official Guide, Source: OG 2020  70  What is the volume of the cube above?  Difficulty: Sub600 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 xâˆ’1?  Difficulty: Sub600 Level, Algebra, Source: Official Guide [Pre2000], Source: OG 1988, Source: Other  Please specify  72  Was the amount of John's heating bill for February greater than it was  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Geometry, Source: GMAT Prep  75  Point (x, y) has in which quadrant of the rectangular coordinate syste  Difficulty: Sub600 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: Sub600 Level, Algebra, Source: Grockit  77  In the figure above, what is the value of z?  Difficulty: Sub600 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: Sub600 Level, Algebra, Source: GMAT Paper Tests  79  What is the value of the integer N?  Difficulty: Sub600 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: Sub600 Level, Word Problems, Source: Princeton Review  81  What is the value of z in the triangle above?  Difficulty: Sub600 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: Sub600 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: Sub600 Level, Geometry, Source: Official Guide [Pre2000]  84  What is the average distance that automobile D travels on one full tan  Difficulty: Sub600 Level, Algebra, Word Problems, Source: Official Guide [Pre2000], Source: OG 1988  85  What was Bill's average speed on his trip of 250 miles from New York  Difficulty: Sub600 Level, Distance/Rate Problems, Source: Manhattan GMAT  86  If u, v, and w are integers, is u > 0 ?  Difficulty: Sub600 Level, Algebra, Source: GMAT Prep  87  What is the value of x? (1) x = 4. (2) x^2 = 16.  Difficulty: Sub600 Level, Absolute Values/Modulus, Algebra, Source: Princeton Review  88  What is the value of xy ?  Difficulty: Sub600 Level, Algebra, Source: GMAT Hacks  89  What is the value of x? (1) 5x  3 = 7 (2) x/10 = 1/5  Difficulty: Sub600 Level, Algebra, Source: Official Guide [Pre2000], Source: OG 1988  90  What were the gross revenues from ticket sales for a certain  Difficulty: Sub600 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: Sub600 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: Sub600 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: Sub600 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: Sub600 Level, Word Problems, Source: Official Guide, Source: OG 2020  95  If x and y are integers, what is the value of x+y?  Difficulty: Sub600 Level, Inequalities, Source: GMAT Prep  96  If machine X ran continuously at a uniform rate to fill  Difficulty: Sub600 Level, Work/Rate Problems  97  Is m > k? (1) 3m > 3k (2) 2m > 2k  Difficulty: Sub600 Level, Inequalities, Source: GMAT Prep  98  Is x a negative number?  Difficulty: Sub600 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: Sub600 Level, Geometry, Source: Magoosh  100  Is w + h^4 positive? (1) h is positive (2) w is positive  Difficulty: Sub600 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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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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29 Jun 2017, 21:57
Thanks BuĂ±uel 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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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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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. Thatâ€™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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