All 22 Quant questions from the CAT 2021 · Slot 3 paper, with the correct answer for each.
A shop owner bought a total of 64 shirts from a wholesale market that came in two sizes, small and large. The price of a small
shirt was INR 50 less than that of a large shirt. She paid a total of INR 5000 for the large shirts, and a total of INR 1800 for the
small shirts. Then, the price of a large shirt and a small shirt together, in INR, is
Correct answer: C · 200
One day, Rahul started a work at 9 AM and Gautam joined him two hours later. They then worked together and completed the
work at 5 PM the same day. If both had started at 9 AM and worked together, the work would have been completed 30
minutes earlier. Working alone, the time Rahul would have taken, in hours, to complete the work is
Correct answer: B · 10
In a tournament, a team has played 40 matches so far and won 30% of them. If they win 60% of the remaining matches, their
overall win percentage will be 50%. Suppose they win 90% of the remaining matches, then the total number of matches won by
the team in the tournament will be
Correct answer: C · 84
The number of distinct pairs of integers (m, n) satisfying |1 + mn| < |m + n| < 5 is (in numerical value)
Correct answer: 12
For a real number a, if (log₁₅ a + log₃₂ a) / ((log₁₅ a)(log₃₂ a)) = 4 then a must lie in the range
Correct answer: C · 4 < a < 5
The total of male and female populations in a city increased by 25% from 1970 to 1980.During the same period, the male
population increased by 40% while the female population increased by 20%. From 1980 to 1990, the female population
increased by25%. In 1990, if the female population is twice the male population, then the percentage increase in the total of
male and female populations in the city from 1970to 1990 is
Correct answer: B · 68.75
Consider a sequence of real number x , x , x , … such that x = x + n – 1 for all n ³ 1. If x = -1 then x is equal to
1 2 3 n+1 n 1 100
Correct answer: D · 4850
The arithmetic mean of scores of 25 students in an examination is 50. Five of these students top the examination with the same
score. If the scores of the other students are distinct integers with the lowest being 30, then the maximum possible score of the
toppers is (in numerical value)
Correct answer: 92
One part of a hostel’s monthly expenses is fixed, and the other part is proportional to the number of its boarders. The hostel
collects ₹ 1600 per month from each boarder. When the number of boarders is 50, the profit of the hostel is ₹ 200 per boarder,
and when the number of boarders is 75, the profit of the hostel is ₹ 250 per boarder. When the number of boarders is 80, the
total profit of the hostel, in INR, will be
Correct answer: B · 20500
The cost of fencing a rectangular plot is ₹ 200 per ft along one side, and ₹ 100 per ft along the three other sides. If the area of
the rectangular plot is 60000 sq. ft, then the lowest possible cost of fencing all four sides, in INR, is
Correct answer: A · 120000
A park is shaped like a rhombus and has area 96 sq m. If 40 m of fencing is needed to enclose the park, the cost, in INR, of
laying electric wires along its two diagonals, at the rate of ₹125 per m, is (in numerical value)
Correct answer: 3500
A tea shop offers tea in cups of three different sizes. The product of the prices, in INR, of three different sizes is equal to 800. The prices of the smallest size and the medium size are in the ratio 2 : 5. If the shop owner decides to increase the prices of the smallest and the medium ones by INR 6 keeping the price of the largest size unchanged, the product then changes to 3200. The sum of the original prices of three different sizes, in INR, is (in numerical value)
Correct answer: 34
Mira and Amal walk along a circular track, starting from the same point at the sometime. If they walk in the same direction, then in 45 minutes, Amal completes exactly3 more rounds than Mira. If they walk in opposite directions, then they meet for the first time exactly after 3 minutes. The number of rounds Mira walks in one hour is (in numerical value)
Correct answer: 8
If a certain weight of an alloy of silver and copper is mixed with 3 kg of pure silver, there sulting alloy will have 90% silver by
weight. If the same weight of the initial alloy is mixed with 2 kg of another alloy which has 90% silver by weight, the resulting
alloy will have 84% silver by weight. Then, the weight of the initial alloy, in kg, is
Correct answer: C · 3
In a triangle ABC, ∆BCA = 50°. D and E are points on AB and AC, respectively, such that AD = DE. If F is a point on BC such that
BD = DF, then ∆FDE, in degrees, is equal to
Correct answer: B · 80
Bank A offers 6% interest rate per annum compounded half yearly. Bank B and Bank Coffer simple interest but the annual
interest rate offered by Bank C is twice that of Bank B. Raju invests a certain amount in Bank B for a certain period and Rupa
invests₹ 10,000 in Bank C for twice that period. The interest that would accrue to Raju during that period is equal to the interest
that would have accrued had he invested the same amount in Bank A for one year. The interest accrued, in INR, to Rupa is
Correct answer: B · 2436
If f(x) = x2 – 7x and g(x) = x + 3, then the minimum value of f(g(x)) – 3x is
Correct answer: D · -16
Anil can paint a house in 12 days while Barun can paint it in 16 days. Anil, Barun, and Chandu undertake to paint the house for
₹ 24000 and the three of them together complete the painting in 6 days. If Chandu is paid in proportion to the work done by
him, then the amount in INR received by him is (in numerical value)
Correct answer: 3000
If $n$ is a positive integer such that $(\sqrt[7]{10})(\sqrt[7]{10})^2 \cdots (\sqrt[7]{10})^n > 999$, then the smallest value of $n$ is (in numerical value)
Correct answer: 6
A four-digit number is formed by using only the digits 1, 2 and 3 such that both 2and 3 appear at least once. The number of all
such four-digit numbers is (in numerical value)
Correct answer: 50
Let ABCD be a parallelogram. The lengths of the side AD and the diagonal AC are 10 cm and 20 cm, respectively. If the angle
$\angle ADC$ is equal to $30^{\circ}$ then the area of the parallelogram, in sq. cm, is
Correct answer: B · $25(\sqrt{3} + \sqrt{15})$
If 3x + 2|y|+ y = 7 and x +|x|+ 3y = 1, then x + 2y is
Correct answer: C · 0