? 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 | A car dealership carries only sedans and SUVs | Difficulty: 805+ (Hard), Percent and Interest Problems, Word Problems, Source: Veritas Prep |
| 2 | Train A leaves New York for Boston at 3 PM and travels at | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Other |
| 3 | GMAT Club Around The World!!! A journalist is writing an article on th | Difficulty: 805+ (Hard), Overlapping Sets, Source: Other |
| 4 | At a certain animal shelter, there are nine dogs available for | Difficulty: 805+ (Hard), Probability, Source: GMAT Ninja |
| 5 | A certain company has 500 employees split among three divisions, such | Difficulty: 805+ (Hard), Word Problems, Source: Other |
| 6 | Each term of the sequence S, starting from the 2nd term is 1 less | Difficulty: 805+ (Hard), Sequences, Source: Other |
| 7 | A certain ride has 60 people standing in line awaiting admission. If | Difficulty: 805+ (Hard), Overlapping Sets, Source: Other |
| 8 | Superfast train A leaves Newcastle for Birmingham at 3 PM and travels | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Veritas Prep |
| 9 | The range of set A is R. A number having a value equal to R is added | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Other |
| 10 | A group of burglars is trying to decide whether to target the houses | Difficulty: 805+ (Hard), Overlapping Sets, Probability, Source: Other |
| 11 | A car manufacturer organized a test drive of two of its prototypes. | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: CrackVerbal |
| 12 | Kunal takes ‘a’ days to complete a work while Sandeep takes ‘b’ less d | Difficulty: 805+ (Hard), Work and Rate Problems, Source: Other |
| 13 | Bob and Wendy left home to walk together to a restaurant for | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Manhattan GMAT |
| 14 | Julian bought 6 kilograms of cheese from each of Deli A and Deli B. At | Difficulty: 805+ (Hard), Word Problems, Source: 800 Score |
| 15 | A newer machine, working alone at its constant rate | Difficulty: 805+ (Hard), Work and Rate Problems, Source: Veritas Prep |
| 16 | Three employees, A, B and C, clean a certain conference room each day. | Difficulty: 805+ (Hard), Work and Rate Problems, Source: Other |
| 17 | There are three different ways to score in basketball. A successful | Difficulty: 805+ (Hard), Word Problems, Source: Kaplan |
| 18 | A certain fruit stand sells only apples for $0.26 each, bananas for $0 | Difficulty: 805+ (Hard), Word Problems, Source: Veritas Prep |
| 19 | The average (arithmetic mean) of the original six prices for six coats | Difficulty: 805+ (Hard), Word Problems, Source: Manhattan GMAT |
| 20 | Between 1980 and 1985, Pierre’s investment portfolio increas | Difficulty: 805+ (Hard), Percent and Interest Problems, Source: Princeton Review |
| 21 | Lily has only red and blue balls in a jar. If she removes three balls | Difficulty: 805+ (Hard), Probability, Source: Experts' Global |
| 22 | Maria drove a distance without stopping such that she covered first | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Other |
| 23 | Six numbers are randomly selected and placed within a set. If the set | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Princeton Review |
| 24 | Each correctional facility in a certain state has the same number of | Difficulty: 805+ (Hard), Word Problems, Source: Other |
| 25 | If John deposited 1000$ in a certain bank account, where the interest | Difficulty: 805+ (Hard), Percent and Interest Problems, Source: Other |
| 26 | A coin purse contains 13 coins, each worth 1, 5, 10, or 25 cents; the | Difficulty: 805+ (Hard), Word Problems, Source: Manhattan GMAT |
| 27 | Jeff drove two laps around a track. Was his average speed less than 60 | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Manhattan GMAT |
| 28 | Jack and Fred wanted to buy ice-creams. If Jack would have 7 cents | Difficulty: 805+ (Hard), Word Problems, Source: Other |
| 29 | A state legislator drafts an income tax proposal that imposes a tax of | Difficulty: 805+ (Hard), Word Problems, Source: Princeton Review |
| 30 | At a restaurant, a group of friends ordered four main dishes | Difficulty: 805+ (Hard), Min-Max Problems, Source: Manhattan GMAT |
| 31 | Allison always leaves her office at 5.00pm and reaches her | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Veritas Prep |
| 32 | Set X consists of 9 positive elements. Set Y consists of the | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Questions from Experts |
| 33 | Reiko drove from point A to point B at a constant speed, and | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Manhattan GMAT |
| 34 | If x, y, and z are integers, and x < y < z, is z y = y | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Manhattan GMAT |
| 35 | The average (arithmetic mean) of the original six prices for six coats | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Manhattan GMAT |
| 36 | In a group of 80 college students, how many own a car? | Difficulty: 805+ (Hard), Overlapping Sets, Source: Magoosh |
| 37 | There are N men in a group. Their average age is 20 years. Find N. | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Other |
| 38 | At a particular store, candy bars are normally priced at $1. | Difficulty: 805+ (Hard), Word Problems, Source: Manhattan GMAT |
| 39 | A quality control worker at a warehouse inspects x separate boxes, eac | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Princeton Review |
| 40 | 40 people admitted to a certain graduate program had taken the TOEFL | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Questions from Experts |
| 41 | A certain salesman's yearly income is determined by a base salary plus | Difficulty: 805+ (Hard), Percent and Interest Problems, Word Problems, Source: Manhattan GMAT |
| 42 | Four friends go to Macys for shopping and buy a top each. Three of th | Difficulty: 805+ (Hard), Word Problems, Source: Veritas Prep |
| 43 | Scientists have discovered a distant exoplanet | Difficulty: 805+ (Hard), Word Problems, Source: Other |
| 44 | Kevin rented a car for a cost of c dollars | Difficulty: 805+ (Hard), Word Problems, Source: Experts' Global |
| 45 | A bag contains four types of coins: 5-cent coins, 10 cent coins, 50-ce | Difficulty: 805+ (Hard), Word Problems, Source: e-GMAT |
| 46 | For the sequence of numbers a1, a2, a3, an, , each term after the | Difficulty: 805+ (Hard), Sequences, Source: Princeton Review |
| 47 | In the morning, Chris drives from Toronto to Oakville and in the eveni | Difficulty: 805+ (Hard), Distance and Speed Problems, Source: Veritas Prep |
| 48 | In the sequence a1,a2,...,an,...,a1=x and an=y–zan−1 for all n>1. Is a3>a2 | Difficulty: 805+ (Hard), Sequences, Source: Veritas Prep |
| 49 | How many subordinates does Marcia have? | Difficulty: 805+ (Hard), Combinations, Source: Other |
| 50 | There are 6 floors in an apartment building. | Difficulty: 805+ (Hard), Word Problems, Source: Magoosh |
| 51 | The average of a set of 7 integers equal 27. If the smallest number of | Difficulty: 805+ (Hard), Min-Max Problems, Source: Other |
| 52 | In the sequence of positive integers a1,a2,a3,...,an−1,an where n > 5 | Difficulty: 805+ (Hard), Sequences, Source: Other |
| 53 | Of the 48 students in a class, 16 like to study History. What percenta | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: e-GMAT |
| 54 | Blair is shopping for a meal. He buys truffles, caviar, tuna, and grap | Difficulty: 805+ (Hard), Word Problems, Source: Princeton Review |
| 55 | At a certain fiorist shop, roses can be purchased either individually | Difficulty: 805+ (Hard), Word Problems, Source: Manhattan GMAT |
| 56 | A group of people is seated at a table at which a toast is made. | Difficulty: 805+ (Hard), Combinations, Source: Princeton Review |
| 57 | The members of a company’s board of directors must select a subcommitt | Difficulty: 805+ (Hard), Combinations, Source: Kaplan |
| 58 | Tom is going to move, he has three kinds of boxes: large, medium, and | Difficulty: 805+ (Hard), Word Problems, Source: Other |
| 59 | The profit P(t) of a startup company, in thousands of dollars,... | Difficulty: 805+ (Hard), Functions and Custom Characters, Word Problems, Source: e-GMAT |
| 60 | One-sixth of the orders placed at a take-out restaurant on Friday nigh | Difficulty: 805+ (Hard), Word Problems, Source: Magoosh |
| 61 | A nonprofit group organizes its local fundraisers in teams, | Difficulty: 805+ (Hard), Word Problems, Source: Veritas Prep |
| 62 | The sequence x1, x2, ... xn is such that x1 = 5, x2 = 5, x3 = 0, x4 = | Difficulty: 805+ (Hard), Sequences, Source: Other |
| 63 | For a trade show, two different cars are selected randomly | Difficulty: 805+ (Hard), Probability, Source: Other |
| 64 | Marco is making z pizzas and will distribute x slices of pepperoni to | Difficulty: 805+ (Hard), Word Problems, Source: Magoosh |
| 65 | During a certain game, after each turn, a player’s points are doubled | Difficulty: 805+ (Hard), Word Problems, Source: Veritas Prep |
| 66 | GMAT Club Around The World!!! All of the 121 baseball players particip | Difficulty: 805+ (Hard), Overlapping Sets, Source: Other |
| 67 | a, b, c, d, and e are five numbers such that a b c d e and e - | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Other |
| 68 | Julie wants to be sure that she has enough pies for each of her | Difficulty: 805+ (Hard), Word Problems, Source: Manhattan GMAT |
| 69 | The cost of 22 CDs, 25 pens & 7 erasers is $ 142. What is the cost of | Difficulty: 805+ (Hard), Word Problems, Source: Other |
| 70 | Is d greater than or equal to 0? 1). d is the median of d, 1/d, -d 2). | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Other |
| 71 | A, B, C and D are in Arithmetic Progression, what is the num | Difficulty: 805+ (Hard), Sequences, Source: Other |
| 72 | At a company with 300 employees who work either in the office or in | Difficulty: 805+ (Hard), Min-Max Problems, Overlapping Sets, Source: Questions from Experts |
| 73 | A committee of 2 people is to be formed from a group of 8 | Difficulty: 805+ (Hard), Probability, Source: Other |
| 74 | Events A and B are independent and have equal probabilities | Difficulty: 805+ (Hard), Probability, Source: Veritas Prep |
| 75 | Of the 5 numbers, the largest number is 4 greater than the median. Is | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Other |
| 76 | A bag contains only black red and gold balls. Any ball is equally like | Difficulty: 805+ (Hard), Probability, Source: 800 Score |
| 77 | Of all the attendees at a dinner party, 40% were women. If | Difficulty: 805+ (Hard), Overlapping Sets, Source: Other |
| 78 | 12 Days of Christmas GMAT Competition - Day 7: j, 9, k, and m are in a | Difficulty: 805+ (Hard), Sequences, Source: Competition Questions, Source: GMATWhiz |
| 79 | Among the respondents of a survey, one-fourth do not like to watch mov | Difficulty: 805+ (Hard), Overlapping Sets, Source: Other |
| 80 | A set of nonnegative integers consists of {x, x + 7, 2x, y, y + 5}. | Difficulty: 805+ (Hard), Sequences, Source: Other |
| 81 | There are seven team and each team has to play with three other teams | Difficulty: 805+ (Hard), Combinations, Source: Other |
| 82 | Laser diodes and micro-controllers are among the components used to ma | Difficulty: 805+ (Hard), Percent and Interest Problems, Source: Princeton Review |
| 83 | 12 Days of Christmas GMAT Competition - Day 8: A certain five-letter | Difficulty: 805+ (Hard), Combinations, Source: Competition Questions, Source: Manhattan GMAT |
| 84 | In the sequence T, the first term is the non-zero number a, and each | Difficulty: 805+ (Hard), Sequences, Source: Kaplan |
| 85 | A and B work at digging a ditch alternately for a day each. If A can | Difficulty: 805+ (Hard), Work and Rate Problems, Source: Other |
| 86 | Jane can paint the wall in J hours, and Bill can paint the | Difficulty: 805+ (Hard), Word Problems, Work and Rate Problems, Source: Other |
| 87 | In a certain company, 25% of the women and 17% of the men participate | Difficulty: 805+ (Hard), Word Problems, Source: Magoosh |
| 88 | In a recently held cricket tournament in one of the universities | Difficulty: 805+ (Hard), Combinations, Word Problems, Source: Other |
| 89 | If z1, z2, z3, ..., zn is a series of zn is a series of n consecutive | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Kaplan |
| 90 | The price per share of stock P increased by a percent over the same | Difficulty: 805+ (Hard), Percent and Interest Problems, Word Problems, Source: Other |
| 91 | If positive integer n<=3 and n is the number of times a coin is flippe | Difficulty: 805+ (Hard), Probability, Source: Other |
| 92 | In a spelling competition, competitors were required to spell 108 | Difficulty: 805+ (Hard), Overlapping Sets, Source: Other |
| 93 | If P is a set of integers, is the average of P equal to the median of | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Princeton Review |
| 94 | As a salesperson, Brandon's compensation is structured so that each | Difficulty: 805+ (Hard), Word Problems, Source: Veritas Prep |
| 95 | Last year, among the 200 companies in Growthia | Difficulty: 805+ (Hard), Overlapping Sets, Source: Questions from Experts |
| 96 | A salesman normally gets a fixed salary of $500 and a commission of 5 | Difficulty: 805+ (Hard), Percent and Interest Problems, Word Problems, Source: Other |
| 97 | Let S be a finite set of consecutive multiples of 7. | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Princeton Review |
| 98 | At the beginning of a show, a lottery representative put one hundred b | Difficulty: 805+ (Hard), Probability, Source: 800 Score |
| 99 | Is the median of the 3 different integers equal to the average (arithm | Difficulty: 805+ (Hard), Statistics and Sets Problems, Source: Math Revolution |
| 100 | If the original price of an item in a retail store is marked | Difficulty: 805+ (Hard), Percent and Interest Problems, Source: Manhattan GMAT |
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Updated on: 01 Jan 2026, 05:45 
