100 Hardest and easiest questions for DS as of June 2025 : Data Sufficiency (DS)

Bunuel · 2015-08-21T03:42:39-07:00

100 Hardest Data Sufficiency Questions (Jun 1st, 2025 - Jul 1st, 2025) 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 In the correctly worked addition problem above, A, B, C, D Difficulty: 805+ Level, Arithmetic, Number Properties, Source: Manhattan GMAT 2 A car dealership carries only sedans and SUVs Difficulty: 805+ Level, Percent and Interest Problems, Word Problems, Source: Veritas Prep 3 If all the N students of a class are classified into groups of either Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: e-GMAT 4 n and k are positive integers. When n is divided by 23, the quotient i Difficulty: 805+ Level, Remainders, Source: GMAT Prep Now 5 P and Q are prime numbers less than 70. What is the units digit of P*Q Difficulty: 805+ Level, Number Properties, Source: e-GMAT 6 A three digit number A with hundreds digit a, tens digit b and units Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: Jamboree 7 At a certain animal shelter, there are nine dogs available for Difficulty: 805+ Level, Probability, Source: GMAT Ninja 8 Superfast train A leaves Newcastle for Birmingham at 3 PM and travels Difficulty: 805+ Level, Distance and Speed Problems, Source: Veritas Prep 9 There is a sequence, 4(10^n), 4(10^(n-1)), ..., 4(10^(n-m)), for posit Difficulty: 805+ Level, Number Properties, Sequences, Source: Math Revolution 10 The average (arithmetic mean) of 5 distinct, single digit integers is Difficulty: 805+ Level, Number Properties, Source: Princeton Review 11 If a and b are two-digit positive integers greater than 10 Difficulty: 805+ Level, Remainders, Source: GMAT Club Tests 12 b, c, d, e, f and g are different positive integers. When b is divided Difficulty: 805+ Level, Remainders, Source: GMAT Prep Now 13 12 Days of Christmas GMAT Competition - Day 8: Set X = {a, b, c, d, 9} Difficulty: 805+ Level, Statistics and Sets Problems, Source: Competition Questions, Source: GMAT Club Tests 14 X is a three-digit positive integer in which each digit is either 1 or Difficulty: 805+ Level, Fractions and Ratios, Remainders, Source: Manhattan GMAT 15 GMAT Club Olympics 2024 (Day 1): In a company, the average (arithmetic Difficulty: 805+ Level, Statistics and Sets Problems, Source: Competition Questions, Source: GMAT Club Tests 16 Mrs. Claus is selecting three reindeer from the herd for a special Difficulty: 805+ Level, Probability, Source: GMAT Club Tests 17 Bob and Wendy left home to walk together to a restaurant for Difficulty: 805+ Level, Distance and Speed Problems, Source: Manhattan GMAT 18 Abe, Beth, Carl and Duncan are four siblings, among which Abe and Carl Difficulty: 805+ Level, Number Properties, Source: e-GMAT 19 W, X, Y, and Z represent distinct digits such that WX * YZ = 1995. Wha Difficulty: 805+ Level, Number Properties, Source: Veritas Prep 20 If a, b, and c are integers such that 0 Difficulty: 805+ Level, Multiples and Factors, Source: Manhattan GMAT 21 The average (arithmetic mean) of the original six prices for six coats Difficulty: 805+ Level, Word Problems, Source: Manhattan GMAT 22 A newer machine, working alone at its constant rate Difficulty: 805+ Level, Work and Rate Problems, Source: Veritas Prep 23 For positive integers n and m (n>m), is the average (arithmetic mean) Difficulty: 805+ Level, Number Properties, Statistics and Sets Problems, Source: Math Revolution 24 In the number 13,52#,@ and # represent distinct digits. Difficulty: 805+ Level, Arithmetic, Multiples and Factors, Source: Princeton Review 25 A car manufacturer organized a test drive of two of its prototypes. Difficulty: 805+ Level, Statistics and Sets Problems, Source: CrackVerbal 26 There are three different ways to score in basketball. A successful Difficulty: 805+ Level, Word Problems, Source: Kaplan 27 Julian bought 6 kilograms of cheese from each of Deli A and Deli B. At Difficulty: 805+ Level, Word Problems, Source: 800 Score 28 If x, y and z are positive integers such that x^4*y^3 = z^2 Difficulty: 805+ Level, Number Properties, Source: e-GMAT 29 Positive integers a, b and c are all less than 10. If the sum of all Difficulty: 805+ Level, Arithmetic, Combinations, Number Properties, Source: GMAT Club Tests 30 A certain fruit stand sells only apples for $0.26 each, bananas for $0 Difficulty: 805+ Level, Word Problems, Source: Veritas Prep 31 x, y are positive integers. Find the number of even factors of 4x^2 Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: e-GMAT 32 Six numbers are randomly selected and placed within a set. If the set Difficulty: 805+ Level, Statistics and Sets Problems, Source: Princeton Review 33 Between 1980 and 1985, Pierre’s investment portfolio increas Difficulty: 805+ Level, Percent and Interest Problems, Source: Princeton Review 34 GMAT CLUB OLYMPICS: In a survey of an Olympic team members, 1/6th of Difficulty: 805+ Level, Overlapping Sets, Source: Competition Questions, Source: GMAT Club Tests 35 A certain diet program calls for eating daily calories from Difficulty: 805+ Level, Word Problems, Source: GMAT Paper Tests 36 In the correctly-worked multiplication problem above, each Difficulty: 805+ Level, Number Properties, Source: Veritas Prep 37 In the correctly-worked multiplication problem above, each symbol repr Difficulty: 805+ Level, Arithmetic, Number Properties, Source: Veritas Prep 38 GMAT Club Olympics 2024 (Day 2): Of the 100 flowers in a garden, 3/4 Difficulty: 805+ Level, Word Problems, Source: Competition Questions, Source: GMAT Club Tests 39 A coin purse contains 13 coins, each worth 1, 5, 10, or 25 cents; the Difficulty: 805+ Level, Word Problems, Source: Manhattan GMAT 40 If a and b are positive integers, what is the remainder when ab is Difficulty: 805+ Level, Multiples and Factors, Number Properties, Remainders, Source: Manhattan GMAT 41 Reiko drove from point A to point B at a constant speed, and Difficulty: 805+ Level, Distance and Speed Problems, Source: Manhattan GMAT 42 Lily has only red and blue balls in a jar. If she removes three balls Difficulty: 805+ Level, Probability, Source: Experts' Global 43 Jeff drove two laps around a track. Was his average speed less than 60 Difficulty: 805+ Level, Distance and Speed Problems, Source: Manhattan GMAT 44 If m and n are non-zero integers, is m6-m5-m4 divisible by n? 1) m2 Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: Math Revolution 45 Allison always leaves her office at 5.00pm and reaches her Difficulty: 805+ Level, Distance and Speed Problems, Source: Veritas Prep 46 If x, y, and z are integers, and x Difficulty: 805+ Level, Statistics and Sets Problems, Source: Manhattan GMAT 47 Is A + B + C even? Difficulty: 805+ Level, Number Properties, Source: GMAT Club Tests 48 1/3 of golfers also play tennis, 3/5 of tennis players also surf. 4/7 Difficulty: 805+ Level, Fractions and Ratios, Overlapping Sets, Probability, Source: Princeton Review 49 Four friends go to Macys for shopping and buy a top each. Three of th Difficulty: 805+ Level, Word Problems, Source: Veritas Prep 50 In a group of 80 college students, how many own a car? Difficulty: 805+ Level, Overlapping Sets, Source: Magoosh 51 If m, n, and p are three-digit integers and m + n = p Difficulty: 805+ Level, Number Properties, Source: Manhattan GMAT 52 A certain salesman's yearly income is determined by a base salary plus Difficulty: 805+ Level, Percent and Interest Problems, Word Problems, Source: Manhattan GMAT 53 The average (arithmetic mean) of the original six prices for six coats Difficulty: 805+ Level, Statistics and Sets Problems, Source: Manhattan GMAT 54 In the morning, Chris drives from Toronto to Oakville and in the eveni Difficulty: 805+ Level, Distance and Speed Problems, Source: Veritas Prep 55 At a particular store, candy bars are normally priced at $1. Difficulty: 805+ Level, Word Problems, Source: Manhattan GMAT 56 A state legislator drafts an income tax proposal that imposes a tax of Difficulty: 805+ Level, Word Problems, Source: Princeton Review 57 w, x, y and z are positive integers such that y Difficulty: 805+ Level, Remainders, Source: GMAT Prep Now 58 w, x, y and z are positive integers. When w is divided by x, the quoti Difficulty: 805+ Level, Multiples and Factors, Remainders, Source: GMAT Prep Now 59 In the sequence a1,a2,…,an,…,a1=x and an=y–zan−1 for all n>1. Is a3>a2 Difficulty: 805+ Level, Sequences, Source: Veritas Prep 60 GMAT Club World Cup 2022 (DAY 10): On a joint company picnic, 160 Difficulty: 805+ Level, Word Problems, Source: Competition Questions, Source: GMAT Club Tests 61 The difference between positive two-digit integer A and the smaller tw Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: Manhattan GMAT 62 Blair is shopping for a meal. He buys truffles, caviar, tuna, and grap Difficulty: 805+ Level, Word Problems, Source: Princeton Review 63 Three positive integers a, b and c leave the same remainder y Difficulty: 805+ Level, Remainders, Source: e-GMAT 64 GMAT Club World Cup 2022 (DAY 1): Mbappé has two types of sneakers Difficulty: 805+ Level, Word Problems, Source: Competition Questions, Source: GMAT Club Tests 65 The members of a company’s board of directors must select a subcommitt Difficulty: 805+ Level, Combinations, Source: Kaplan 66 If x and y are positive integers, what is the value of x? Difficulty: 805+ Level, Remainders, Source: GMAT Prep Now 67 A bag contains four types of coins: 5-cent coins, 10 cent coins, 50-ce Difficulty: 805+ Level, Word Problems, Source: e-GMAT 68 Set P consists of the first n positive multiples of 3 and set Q consis Difficulty: 805+ Level, Number Properties, Source: e-GMAT 69 In the correctly worked addition problem above, M, N, R, S, T and V Difficulty: 805+ Level, Arithmetic, Source: Veritas Prep 70 Merle's spare change jar has exactly 16 U.S. coins, each of which is a Difficulty: 805+ Level, Word Problems, Source: Official Guide 71 Is x divisible by 39? Difficulty: 805+ Level, Multiples and Factors, Remainders, Source: Kaplan 72 How many prime factors does positive integer n have? Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: Veritas Prep 73 A quality control worker at a warehouse inspects x separate boxes, eac Difficulty: 805+ Level, Statistics and Sets Problems, Source: Princeton Review 74 Of the 48 students in a class, 16 like to study History. What percenta Difficulty: 805+ Level, Statistics and Sets Problems, Source: e-GMAT 75 W, X, Y and Z are four different positive integers. Difficulty: 805+ Level, Remainders, Source: GMAT Prep Now 76 12 Days of Christmas GMAT Competition - Day 5: On a farm with a total Difficulty: 805+ Level, Word Problems, Source: Competition Questions, Source: GMAT Club Tests 77 If N is a positive three-digit number that is greater than 2 Difficulty: 805+ Level, Fractions and Ratios, Number Properties, Source: Manhattan GMAT 78 A nonprofit group organizes its local fundraisers in teams, Difficulty: 805+ Level, Word Problems, Source: Veritas Prep 79 There are 6 floors in an apartment building. Difficulty: 805+ Level, Word Problems, Source: Magoosh 80 For the sequence of numbers a1, a2, a3, an, , each term after the Difficulty: 805+ Level, Sequences, Source: Princeton Review 81 Students in a class are arranged to form groups of 4 members each Difficulty: 805+ Level, Remainders, Source: Veritas Prep 82 If 10^a * 3^b * 5^c = 450^n, what is the value of c? Difficulty: 805+ Level, Number Properties, Source: Veritas Prep 83 One-sixth of the orders placed at a take-out restaurant on Friday nigh Difficulty: 805+ Level, Word Problems, Source: Magoosh 84 A drawer contains 6 socks. If two socks are randomly Difficulty: 805+ Level, Probability, Source: GMAT Prep Now 85 It has been proposed that teenagers aged 10 to 15 years be restricted Difficulty: 805+ Level, Source: Official Guide, Source: Data Insights Review 2024-2025, Non-Math Related 86 A dental licensure exam requires a 75% minimum score in orde Difficulty: 805+ Level, Fractions and Ratios, Word Problems, Source: Veritas Prep 87 If x is a positive integer greater than 1, and y is the smallest posit Difficulty: 805+ Level, Number Properties, Source: Manhattan GMAT 88 12 Days of Christmas GMAT Competition - Day 2: Jingle, an elf Difficulty: 805+ Level, Statistics and Sets Problems, Source: Competition Questions, Source: GMAT Club Tests 89 GMAT CLUB OLYMPICS: If x > 0, is 1/x a prime number ? Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: Competition Questions, Source: GMAT Club Tests 90 Rosalie tosses a coin a number of times and counts the total number of Difficulty: 805+ Level, Probability, Source: Princeton Review 91 Julie wants to be sure that she has enough pies for each of her Difficulty: 805+ Level, Word Problems, Source: Manhattan GMAT 92 Marco is making z pizzas and will distribute x slices of pepperoni to Difficulty: 805+ Level, Word Problems, Source: Magoosh 93 For positive integers n and m (n>m), is the average (arithmetic mean) Difficulty: 805+ Level, Number Properties, Source: Math Revolution 94 When a certain drug was administered to a group of patients, some pati Difficulty: 805+ Level, Overlapping Sets, Source: GMAT Prep (Focus only) 95 Each of seven consecutive integers, all greater than positive integer Difficulty: 805+ Level, Multiples and Factors, Number Properties, Statistics and Sets Problems, Source: Manhattan GMAT 96 GMAT CLUB OLYMPICS: If x is a positive integer greater than 3 and x^4 Difficulty: 805+ Level, Multiples and Factors, Remainders, Source: Competition Questions, Source: GMAT Club Tests 97 Events A and B are independent and have equal probabilities Difficulty: 805+ Level, Probability, Source: Veritas Prep 98 If x is a positive integer greater than 1, is x a prime numb Difficulty: 805+ Level, Multiples and Factors, Number Properties, Source: GMAT Club Tests 99 During a certain game, after each turn, a player’s points are doubled Difficulty: 805+ Level, Word Problems, Source: Veritas Prep 100 p, q and r are positive integers such that p Difficulty: 805+ Level, Fractions and Ratios, Multiples and Factors, Number Properties, Source: GMATWhiz

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100 Hardest and easiest questions for DS as of June 2025

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GMAT Data Sufficiency (DS) Questions

100 Hardest and easiest questions for DS as of June 2025

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