The Hardest Problem Solving Questions Posted in 2020
In descending order.

1024| The roots of x^2 - px + 12 = 0, where p is a negative constant and x
984| One side of a parking stall is defined by a straight stripe that consi
981| Cities A and B are in different time zones. A is located 3000 km east
942| In what time a cistern is filled by three pipes of diameter 2cm, 4cm a
941| A soccer team played 25% more matches year-on-year in the second year
922| If the following expression extends to an infinite number of roots, th
917| In a test consisting of 15 questions, 3 marks are awarded for a correc
895| If x is an integer and f(x) = |x| + |x + 3| + |x + 6| + |x + 9| + |x +
886| A Metro train from Mumbai to Gurgaon has capacity to board 900 people.
886| If x and y are integers and 12x + 5y^2 = 0. Which of the following mus
886| How many integers satisfy the following equation ?
884| The integer 120 has many factorizations. For example, 120 = (2)(60), 1
876| A square is drawn in the coordinate plane with its vertices at the
873| What is the greatest positive integer n such that 5^n divides 10! (2
868| Ricks Sandwich Shop lets customers create their own sandwiches by cho
868| The integer a is less than 1, and the integer d is greater than 1. If
862| The length of sides of triangle PQR are p, q and r units. The length
854| How many value of x satisfy |x|(6x^2 + 1 ) = 5x^2 ?
853| Only a single rail track exists between station A and B on a railway
850| If x^2 + y^2 = 1, what is the the maximum value of x^2 + 4xy y^2
847| A work is done by 15 workers not all of them have the same capacity to
839| If |x| < 100 and |y| < 100, then what is the number of ordered pairs
839| Let n be a positive integer that has the same digit appearing in all
834| If the selling price of a mat is five times the discount offered
828| The line x + y - 3 = 0 intersects the y-axis at the point P and the

The Hardest Data Sufficiency Questions Posted in 2020
In descending order.

985| |If n > 2 and n^4 - 5n^2 + 4 = 20h, is h an integer?
910| |Of all the sheets of paper in the tray of Printer A, 20% are removed a
898| |Each term of the sequence S, starting from the 2nd term is 1 less
895| |The members of a companys board of directors must select a subcommitt
889| |If x is a positive integer and f(x) = x x^2 x^3 + x^4 + x^5 x^6
867| |Are the digits A and B consecutive integers?
850| |Jeff drove two laps around a track. Was his average speed less than 60
842| |If n is a positive integer, and (45*14*7^n - 15*7^(n - 1)*54)^(1/2) is
838| |How many factors does positive integer z have?
808| |If x and y are positive integers, is (x+2)^(y+2)+x^y(y2)^(x+2) even
802| |An n-sided die has sides labeled with the numbers 1 through n, incl
798| |16 numbers (not necessarily distinct) are filled in the 4x4 square gri
796| |P, Q, R , S, T, U are positive integers, such that S/P + T/Q = U/R, is
795| |A car manufacturer organized a test drive of two of its prototypes.
789| |12 Days of Christmas GMAT Competition - Day 8: Set X = {a, b, c, d, 9}
788| |If each of d, q, and r is a positive integer such that dq + r = 3, wha
788| |If a and b are nonzero integers, is a^b an integer?
787| |The absolute difference between a two digit number and the number form
787| |If (ax + by)^2 = (bx + ay)^2, what is the value of a b ?
786| |What is the numerical value of
784| |If A and B are non-zero numbers such that AB >0, is |A - B| > |A| - |B
782| |For distinct positive integers x and y, where x < y, the function FP(x
777| |Laser diodes and micro-controllers are among the components used to ma
777| |After an attempted breakout at Folsom State Prison, the warden lines
772| |Jack and Fred wanted to buy ice-creams.

The Best Problem Solving Discussions Posted In 2020
* Numbers before links indicate the number of Kudos and Bookmarks received by the post in 2020.


176| |HOT Competition: Set A consists of five integers: 2, 4, 5, 6, and 7. X
144| |HOT Competition: Rice of two different varieties A and B are mixed tog
138| |The digit 7 appears in how many of the first thousand positive integer
137| |The outer dimensions of a closed rectangular cardboard box are 8 centi
133| |HOT Competition 27 Aug/8AM: When the digits of two-digit positive inte
123| |One side of a parking stall is defined by a straight stripe that consi
123| |Yesterday, Candice and Sabrina trained for a bicycle race by riding ar
121| |HOT Competition 28 Aug/8AM: If a convex polygon has 88 more diagonals
116| |HOT Competition 26 Aug/8PM: When positive integer n is divided by 14,
115| |In the figure above, ABCD is a parallelogram and E is the midpoint of
114| |HOT Competition 27 Aug/8PM: Triangle ABC has side lengths n, n+2, and
114| |HOT Competition: If 3^b (3^8 + 3^6) = 0, what is the approximate val
109| |If y = |3x - 5|/(-x^2 - 3) for what value of x will the value of y be
102| |What values of x have a corresponding value of y that satisfies both x
96| |The set of solutions for the equation (x^2 25)^2 = x^2 10x + 25 co
94| |Jorge's bank statement showed a balance that was $0.54 greater than wh
92| |HOT Competition 28 Aug/8PM: When 120 candies are given to 25 children
91| |HOT Competition 31 Aug/8AM: What is the sum of all possible values of
89| |HOT Competition 2 Sep/8AM: Three athletes A, B and C run a 1000 m race
89| |HOT Competition 31 Aug/8AM: Lets assume that 328 children are born in
88| |HOT Competition: On Sunday, in Alexas stable, the ratio of the number
86| |HOT Competition 28 Aug/8AM: When the digits of two-digit positive inte
86| |November 16, 2001, was a Friday. If each of the years 2004, 2008, and
84| |What is the greatest positive integer n such that 5^n divides 10! (2
82| |12 Days of Christmas GMAT Competition - Day 2: On a San Diego Comic-Co

The Best Data Sufficiency Discussions Posted In 2020

146| |An estimate of an actual data value has an error of p percent if p = |
131| |HOT Competition: Is |x+y| > |x-y| ? (1) |x| > |y| (2) |x - y| < |x|
96| |HOT Competition 26 Aug/8PM: If the length and breadth of rectangle ABC
91| |HOT Competition 27 Aug/8PM: If k is a positive integer, is k^(1/2) an
83| |HOT Competition 1 Sep/8PM: If x and y are positive integers, is x + y
80| |Machines K, M, and N, each working alone at its constant rate, produce
80| |At a certain clothing store, customers who buy 2 shirts pay the regula
73| |HOT Competition 26 Aug/8AM: What is the units digit of n^(p+1), where
71| |HOT Competition: If n is a positive integer, then n is a multiple of
70| |The table shows the number of people who responded yes or no or d
65| |HOT Competition: If x is not equal to y, is 1/(x - y) > xy?
64| |Yesterday Bookstore B sold twice as many softcover books as hardcover
61| |HOT Competition 27 Aug/8AM: What is the value of positive integer q?
57| |HOT Competition: A function g is defined, for all positive integers x
54| |What percent of the students at University X are enrolled in a science
51| |HOT Competition 1 Sep/8AM: If x 5 and x is a non-zero integer, what
47| |HOT Competition 2 Sep/8AM: What is the probability of getting four tai
44| |HOT Competition 2 Sep/8PM: If k is a positive integer and 175 divided
43| |Jeff drove two laps around a track. Was his average speed less than 60
42| |Was Store K's profit last month at least 10 percent greater than its
40| |Maria left home 1/4 hour after her husband and drove over the same rou
38| |Is the standard deviation of the numbers in list R less than the stand
38| |What is the median of the nine consecutive even integers in a certain
38| |HOT Competition (Instagram) 31 Aug/11:00AM: On a certain farm, the rat
34| |12 Days of Christmas GMAT Competition - Day 11: If p is a positive mul

The Best Main Math Forum Discussions Posted In 2020

52| |Best Of The Best Of 2019: QUANTITATIVE
28| |Quant Prepathon - 7 Days, 7 Lessons & 1 Objective - Solving Qs in 2min
9| |Six Process Skills in Quant
8| |Absolute Equations
7| |Quant Formulas
7| |Rusty with maths
7| |PEMDAS in negative base
7| |The Official Guide for GMAT Quantitative Review 2021
6| |How to Solve: Remainders (Basics and Advanced)
6| |Improving Quant accuracy on practice tests and speeding up studying ti
6| |Wavy curve method of solving inequalities
6| |In the last two weeks, I took two official mba.com mocks (5&6),
6| |Struggling with Quant Timing
6| |10 must NOT DOs for GMAT math Data sufficiency questions
5| |When do you multiply both numerator and denominator vs numerator only?
5| |Steering clear of DS traps - Lesson 4 - Quant Prepathon
5| |3 sets Venn Diagram questions
5| |Combinatorics
5| |Why is Infer a critical process skill to master GMAT Quant?
5| |triangles
5| |GMATBuster's Webinar
5| |Why is Translate process skill so important to solve Quant Questions
4| |Grand OG Quant Review Collection by GMATinsight (with Video Solution)
4| |Strategy for Q50 in Quants
4| |Facing Difficulties to solve 700 level in Quant

The Best Integrated Reasoning Discussions Posted In 2020
* Numbers before links indicate the number of Kudos and Bookmarks received by the post in 2020.

71| |Integrated Reasoning (IR) Mega thread - 2020 Edition
19| |The effect of voters previously stated preference regarding the issue
14| |Perry, Maria, and Lorna are painting rooms in a college dormitory.
12| |IR Butler Competition 2021 - Participate and Win!
8| |The rate of growth in global coffee consumption has been falling behin
7| |Executive Assessment - Integrated Reasoning Section
7| |Ashish: Studies have connected the recent rise of sugar-sweetened beve
6| |The table shows the dollar value in millions for select Brazilian expo
6| |As part of a routine safety audit of the airline industry, a governmen
6| |On Days 1 through 4 of a recent week, Product X was out of stock at Re
6| |The attached graph displays the percent change in the average consumer
6| |The CTO has to transmit data files that are a total of 1,548 megabits.
6| |INTEGRATED REASONING
6| |Growth of International Immigrant Populations For selected countries
6| |Common IR Traps
5| |Premiolex Corporation spokesperson: In our survey of Premiolex custome
5| |Miguels online banking password is nine characters long and includes
5| |A city is hosting a table tennis tournament for its residents. Each
5| |During a recent semester at University X, 25 students enrolled in an
5| |A portion of an automobile test track is divided into Segment A, Segme
5| |The chart depicts the organizational structure of the government of Ci
5| |Researchers recently examined the initial public offering (IPO)
5| |Kartman's Department Store sales figures for the first week of the
5| |The table lists the women enrolled as a percent of the total enrollmen
5| |The graph above shows the relationship between cold calls and sales

Who To Follow In Quantitative Forums And Their Five Best Posts In 2020
*Number in front of username indicates the total number of Kudos accumulated by the user in Quantitative forums in 2020.

11539| Bunuel
59| |The digit 7 appears in how many of the first thousand positive integer
47| |A soccer team played 25% more matches year-on-year in the second year
45| |Best Of The Best Of 2019: QUANTITATIVE
32| |Integers from 1 to 25 (both inclusive) are split into 5 groups of 5 nu
29| |If a > b > c > 0, then what is the value of the minimum value of the
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1827| GMATinsight
66| |In the figure above, ABCD is a parallelogram and E is the midpoint of
55| |At a certain clothing store, customers who buy 2 shirts pay the regula
23| |HOT Competition: If n is a positive integer, then n is a multiple of
18| |A number 4^16 + 1 is divisible by x. Which among the following is also
17| |An estimate of an actual data value has an error of p percent if p = |
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1561| BrentGMATPrepNow
69| |A pentagon with 5 sides of equal length and 5 interior angles of equal
33| |Re: One side of a parking stall is defined by a straight stripe that consi
31| |Re: Jorge's bank statement showed a balance that was $0.54 greater than wh
30| |What values of x have a corresponding value of y that satisfies both x
30| |If y = |3x - 5|/(-x^2 - 3) for what value of x will the value of y be
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1541| nick1816
15| |triangle ABC has coordinates A= (-4, 0), B= (4 , 0), and C= (0 , 3). L
14| |What values of x have a corresponding value of y that satisfies both x
14| |What is the greatest positive integer n such that 5^n divides 10! (2
13| |If y = |3x - 5|/(-x^2 - 3) for what value of x will the value of y be
11| |Re: One side of a parking stall is defined by a straight stripe that consi
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1398| parkhydel
100| |An estimate of an actual data value has an error of p percent if p = |
91| |The outer dimensions of a closed rectangular cardboard box are 8 centi
71| |One side of a parking stall is defined by a straight stripe that consi
62| |Yesterday, Candice and Sabrina trained for a bicycle race by riding ar
61| |What is the greatest positive integer n such that 5^n divides 10! (2
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1112| chetan2u
11| |Yesterday, Candice and Sabrina trained for a bicycle race by riding ar
10| |Re: At a certain factory, each of Machines A, B, and C is periodically on
10| |Re: If x is a positive integer, r is the remainder when x is divided by 4,
8| |Find the remainder when (1!)^2 + (2!)^2 + (3!)^2 + ... + (N!)^2
8| |Re: A manufacturer wants to produce x balls and y boxes. Resource constrai
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1063| MathRevolution
21| |Point P is on the line y = 2x + a. The x-coordinate of P is 4. The a
13| |The intersections of the graph y = x2 + ax + 4 and y = 3x + b are two
13| |What is the value of (1 - 122)(1 - 132)(1 - 142).(1 - 1202)?
12| |As the figure shows AD = 3, BD = 5 and BC = 9. Moreover, point I is t
12| |The triangle ABC is an acute triangle with AB = 7, AC = 9 and x = BC
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1019| ScottTargetTestPrep
25| |Re: If Whitney wrote the decimal representations for the first 300 positiv
19| |Re: November 16, 2001, was a Friday. If each of the years 2004, 2008, and
10| |Re: In the figure above, if MNOP is a trapezoid and NOPR is a pa
8| |Re: To 100 litres of milk, 10 litres of water is added and then 20 litres
8| |Re: A factory assembles Product X from three components, A, B, and C. One
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822| GMATBusters
16| |if a^2 * a^b = a^z ,
15| |Bob speaks truth 3 out of 4 times, He throws a die and reports that it
14| |Ram went to a Hotel for a Wedding Reception.
13| |Is 9 the HCF of p and q?
13| |What is the highest power of 2 in n!?
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780| CrackVerbalGMAT
9| |Re: A four-digit number with consecutive positive integers is a product of
8| |Re: At a certain clothing store, customers who buy 2 shirts pay the regula
8| |Ben combines x liters of milk that contains 10% water W, by weight....
7| |Re: If integer x is chosen at random from 50 to 149 inclusive, what is the
6| |Re: Line A, of which equation is ax+by=c, is perpendicular to li
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771| yashikaaggarwal
14| |A sum of $6600 was taken as loan. This is to be repaid in two annual
10| |Re: a, b, and c are positive integers with abc + 2ab + 2bc + 2ca + 4a + 4b
10| |The digit 7 appears in how many of the first thousand positive integer
9| |A train's journey is disrupted due to an accident on its track
9| |A hollow right circular cylinder of radius r and height 4r is standing
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693| Sajjad1994
16| |Green paint is made by mixing blue paint with yellow paint in a ratio
14| |A beaker contains 100 milligrams of a solution of salt and water that
12| |If two distinct integers x and y are randomly selected from the intege
12| |For how many values of x from 1 to 300, inclusive, is the sum of the i
11| |An unpainted wall with a total area of 100 square feet needed to be pa
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680| IanStewart
11| |Re: Find the value of (A+B+C+D+E) ?
6| |Re: In the xy plane, a circle is drawn with the center at (3, -2). The cir
6| |Re: Under a certain companys medical insurance plan, the amount an employ
6| |Re: A student needs an alarm clock to wake up, which has proven to success
6| |Re: In the fractions a/b and c/d, where a, b, c and d are positive integer
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640| VeritasKarishma
15| |Re: Tanks A and B are each in the shape of a right circular cylinder. The
14| |Re: A person walked completely around the edge of a park beginning at the
10| |Re: To 100 litres of milk, 10 litres of water is added and then 20 litres
10| |Re: From a solution containing milk and water in the ratio 2 : 3, 15 litre
9| |Re: From a 100 litre container having milk and water in the ratio 8 : 7, 1
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601| GMATWhizTeam
22| |Quant Prepathon - 7 Days, 7 Lessons & 1 Objective - Solving Qs in 2min
6| |Re: If x and y are positive integers, is (x+2)^(y+2)+x^y(y2)^(x+2) even
6| |If p and q are positive integers such that p = 4q 3....
6| |Re: In a class of 345 students, equal number of students enrolled in Engli
6| |What is the remainder when the positive integer P is divided by 6?
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495| Kinshook
10| |Re: If n is a positive integer and n! is a multiple of 2^20 but not 3^20
7| |Re: What is 12+16+112+120+130+142+156?
5| |Re: HOT Competition 31 Aug/8PM: The figure above shows four identical quar
5| |Re: What percent of the students at University X are enrolled in a science
5| |Re: A train meets with an accident and travels at 4/7th of its regular spe
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459| Dillesh4096
15| |Find the remainder when 25^18 is divided by 9
13| |If a pair of dice is rolled 4 times. Find the probability of
13| |The cardinality of a finite set is the number of elements in the set.
11| |Re: What is the sum of all the four-digit numbers formed by digits 3, 5, 5
9| |If the difference between the roots of the equation x^2 + ax + 1 = 0
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446| lacktutor
17| |Yesterday, Candice and Sabrina trained for a bicycle race by riding ar
13| |Re: If n = 9! 6^4, which of the following is the greatest integer k such
11| |What is the remainder when 25^25 is divided by 9?
9| |Machines K, M, and N, each working alone at its constant rate, produce
8| |What is the sum of all integers x satisfying |x^2 - 5x| < 6 ?
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433| sjuniv32
23| |If x and y are integers and 12x + 5y^2 = 0. Which of the following mus
15| |Over a span of 3 lacrosse games, Sara scored x, y and z goals, respect
12| |What is the greatest prime factor of 25^2 + 44^2 + 2200?
12| |Is |x| < 1? (1)|x + 2| < 3 (2)|x + 4| > 3
11| |How many positive integers less than 500 are divisible by 6, 8 or 10?
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424| gmatt1476
58| |In a poll, 200 subscribers to Financial Magazine X indicated which of
46| |Last year a state senate consisting of only Republican and Democrat me
35| |If k and n are positive integers such that n > k, then k! + (n-k)*(k-1
33| |Carol purchased one basket of fruit consisting of 4 Apples and 2 Orang
32| |One inch represents 20 miles on Map K and one inch represents 30 miles