CAT 2020 Question Paper With Answers & Explanation

QA

Q. 1 In a group of 10 students, the mean of the lowest 9
scores is 42 while the mean of the highest 9 scores
is 47. For the entire group of 10 students, the
maximum possible mean exceeds the minimum
possible mean by

Q. 2 From an interior point of an equilateral triangle,
perpendiculars are drawn on all three sides. The sum
of the lengths of the three perpendiculars is s. Then
the area of the triangle is

Q. 4 The sum of the perimeters of an equilateral triangle
and a rectangle is 90 cm. The area, T, of the triangle
and the area, R, of the rectangle, both in sq cm,
satisfy the relationship R = T^{2}. If the sides of the
rectangle are in the ratio 1:3, then the length, in cm,
of the longer side of the rectangle, is

Q. 5 In a car race, car A beats car B by 45 km, car B
beats car C by 50 km, and car A beats car C by 90
km. The distance (in km) over which the race has
been conducted is

Q. 6 A sum of money is split among Amal, Sunil and Mita
so that the ratio of the shares of Amal and Sunil is
3:2, while the ratio of the shares of Sunil and Mita is
4:5. If the difference between the largest and the
smallest of these three shares is Rs 400, then Sunil’s
share, in rupees, is

Q. 7 The distance from B to C is thrice that from A to B.
Two trains travel from A to C via B. The speed of train
2 is double that of train 1 while traveling from A to B
and their speeds are interchanged while traveling from
B to C. The ratio of the time taken by train 1 to that
taken by train 2 in travelling from A to C is

Q. 8 Two circular tracks T1 and T2 of radii 100 m and 20
m, respectively touch at a point A. Starting from A at
the same time, Ram and Rahim are walking on track
T1 and track T2 at speeds 15 km/hr and 5 km/hr
respectively. The number of full rounds that Ram will
make before he meets Rahim again for the first time
is

Q. 10 Anil buys 12 toys and labels each with the same
selling price. He sells 8 toys initially at 20% discount
on the labeled price. Then he sells the remaining 4
toys at an additional 25% discount on the discounted
price. Thus, he gets a total of Rs 2112, and makes a
10% profit. With no discounts, his percentage of profit
would have been

Q. 12 In May, John bought the same amount of rice and
the same amount of wheat as he had bought in April,
but spent Rs. 150 more due to price increase of rice
and wheat by 20% and 12%, respectively. If John
had spent Rs. 450 on rice in April, then how much did
he spend on wheat in May?

Q. 15 Let C be a circle of radius 5 meters having center at
O. Let PQ be a chord of C that passes through points
A and B where A is located 4 meters north of O and
B is located 3 meters east of O. Then, the length of
PQ, in meters, is nearest to

Q. 16 For the same principal amount, the compound
interest for two years at 5% per annum exceeds the
simple interest for three years at 3% per annum by
Rs 1125. Then the principal amount in rupees is

Q. 18 A and B are two points on a straight line. Ram runs
from A to B while Rahim runs from B to A. After
crossing each other, Ram and Rahim reach their
destinations in one minute and four minutes,
respectively. If they start at the same time, then the
ratio of Ram’s speed to Rahim’s speed is

Q. 19 Let C1 and C2 be concentric circles such that the
diameter of C1 is 2 cm longer than that of C2. If a
chord of C1 has length 6 cm and is a tangent to C2,
then the diameter, in cm, of C1 is

Q. 23 Students in a college have to choose at least two
subjects from chemistry, mathematics and physics.
The number of students choosing all three subjects
is 18, choosing mathematics as one of their subjects
is 23 and choosing physics as one of their subjects
is 25. The smallest possible number of students who
could choose chemistry as one of their subjects is

Q. 25 John takes twice as much time as Jack to finish a
job. Jack and Jim together take one-thirds of the
time to finish the job than John takes working alone.
Moreover, in order to finish the job, John takes three
days more than that taken by three of them working
together. In how many days will Jim finish the job
working alone?