CAT Quant Questions

Time Work

When they work alone, B needs 25% more time to finish a job than A does. They two finish the job in 13 days in the following manner: A works alone till half the job is done, then A and B work together for four days, and finally B works alone to complete the remaining 5% of the job. In how many days can B alone finish the entire job?

  1. 20
  2. 16
  3. 22
  4. 18

Time Work

Humans and robots can both perform a job but at different efficiencies. Fifteen humans and five robots working together take thirty days to finish the job, whereas five humans and fifteen robots working together take sixty days to finish it. How many days will fifteen humans working together (without any robot) take to finish it?

  1. 36
  2. 32
  3. 45
  4. 40

Time Distance

The distance from A to B is 60 km. Partha and Narayan start from A at the same time and move towards B. Partha takes four hours more than Narayan to reach B. Moreover, Partha reaches the mid-point of A and B two hours before Narayan reaches B. The speed of Partha, in km per hour, is

  1. 4
  2. 6
  3. 5
  4. 3

Relations Functions

Let f(x) = min{2x2, 52 − 5x}, where x is any positive real number. Then the maximum possible value of f(x) is

Interests

John borrowed Rs. 2,10,000 from a bank at an interest rate of 10% per annum, compounded annually. The loan was repaid in two equal instalments, the first after one year and the second after another year. The first instalment was interest of one year plus part of the principal amount, while the second was the rest of the principal amount plus due interest thereon. Then each instalment, in Rs., is

Ratio Proportion

Two types of tea, A and B, are mixed and then sold at Rs. 40 per kg. The profit is 10% if A and B are mixed in the ratio 3 : 2, and 5% if this ratio is 2 : 3. The cost prices, per kg, of A and B are in the ratio

  1. 18 : 25
  2. 19 : 24
  3. 21 : 25
  4. 17 : 25

Percentages

In an examination, the maximum possible score is N while the pass mark is 45% of N. A candidate obtains 36 marks, but falls short of the pass mark by 68%. Which one of the following is then correct?

  1. N ≤ 200
  2. 243 ≤ N ≤ 252
  3. N ≥ 253
  4. 201 ≤ N ≤ 242

Relations Functions

If f(x + 2) = f(x) + f(x + 1) for all positive integers x, and f(11) = 91, f(15) = 617, then f(10) equals

Numbers

The number of integers x such that 0.25 < 2x < 200, and 2x + 2 is perfectly divisible by either 3 or 4, is

Quant PnC

How many numbers with two or more digits can be formed with the digits 1, 2, 3, 4, 5, 6, 7, 8, 9, so that in every such number, each digit is used at most once and the digits appear in the ascending order?

Geometry

In a circle with center O and radius 1 cm, an arc AB makes an angle 60 degrees at O. Let R be the region bounded by the radii OA, OB and the arc AB. If C and D are two points
on OA and OB, respectively, such that OC = OD and the area of triangle OCD is half that of R, then the length of OC, in cm, is

  1. (π/3√3)1/2
  2. (π/4)1/2
  3. (π/6)1/2
  4. (π/4√3)1/2

Geometry

In a parallelogram ABCD of area 72 sq cm, the sides CD and AD have lengths 9 cm and 16 cm, respectively. Let P be a point on CD such that AP is perpendicular to CD. Then the area, in sq cm, of triangle APD is

  1. 18√3
  2. 24√3
  3. 32√3
  4. 12√3

Geometry

Let ABCD be a rectangle inscribed in a circle of radius 13 cm. Which one of the following pairs can represent, in cm, the possible length and breadth of ABCD?

  1. 24, 10
  2. 25, 9
  3. 24, 12
  4. 25, 10

Ratio Proportion

Raju and Lalitha originally had marbles in the ratio 4:9. Then Lalitha gave some of her marbles to Raju. As a result, the ratio of the number of marbles with Raju to that with Lalitha became 5:6. What fraction of her original number of marbles was given by Lalitha to Raju?

  1. 1/4
  2. 7/33
  3. 1/5
  4. 6/19

Averages

A CAT aspirant appears for a certain number of tests. His average score increases by 1 if the first 10 tests are not considered, and decreases by 1 if the last 10 tests are not considered. If his average scores for the first 10 and the last 10 tests are 20 and 30, respectively, then the total number of tests taken by him is

Profit Loss

A wholesaler bought walnuts and peanuts, the price of walnut per kg being thrice that of peanut per kg. He then sold 8 kg of peanuts at a profit of 10% and 16 kg of walnuts at a profit of 20% to a shopkeeper. However, the shopkeeper lost 5 kg of walnuts and 3 kg of peanuts in transit. He then mixed the remaining nuts and sold the mixture at Rs. 166 per kg, thus making an overall profit of 25%. At what price, in Rs. per kg, did the wholesaler buy the walnuts?

  1. 98
  2. 96
  3. 84
  4. 86

Quant Sets

Each of 74 students in a class studies at least one of the three subjects H, E and P. Ten students study all three subjects, while twenty study H and E, but not P. Every student who studies P also studies H or E or both. If the number of students studying H equals that studying E, then the number of students studying H is

Time Distance

Train T leaves station X for station Y at 3 pm. Train S, traveling at three quarters of the speed of T, leaves Y for X at 4 pm. The two trains pass each other at a station Z, where the distance between X and Z is three-fifths of that between X and Y. How many hours does train T take for its journey from X to Y?

Logarithms

log12 81 = p, then 3[(4-p)/(4+p)] is equal to

  1. log4 16
  2. log6 8
  3. log6 16
  4. log2 8

Mensuration

A right circular cone, of height 12 ft, stands on its base which has diameter 8 ft. The tip of the cone is cut off with a plane which is parallel to the base and 9 ft from the base. With π = 22/7, the volume, in cubic ft, of the remaining part of the cone is

Geometry

Points E, F, G, H lie on the sides AB, BC, CD, and DA, respectively, of a square ABCD. If EFGH is also a square whose area is 62.5% of that of ABCD and CG is longer than EB, then the ratio of length of EB to that of CG is

  1. 2 : 5
  2. 4 : 9
  3. 3 : 8
  4. 1 : 3

Numbers

While multiplying three real numbers, Ashok took one of the numbers as 73 instead of 37. As a result, the product went up by 720. Then the minimum possible value of the sum of squares of the other two numbers is

Logarithms

If x is a positive quantity such that 2x = 3log5 2, then x is equal to

  1. 1 + log3 5/3
  2. log5 8
  3. 1 + log5 3/5
  4. log5 9

Polynomials L1

If u2 + (u − 2v − 1)2 = −4v(u + v), then what is the value of u + 3v?

  1. 1/4
  2. 0
  3. 1/2
  4. -1/4

Progressions

Given an equilateral triangle T1 with side 24 cm, a second triangle T2 is formed by joining the midpoints of the sides of T1. Then a third triangle T3 is formed by joining the midpoints of the sides of T2. If this process of forming triangles is continued, the sum of the areas, in sq cm, of infinitely many such triangles T1, T2, T3, ... will be

  1. 164√3
  2. 188√3
  3. 248√3
  4. 192√3

Averages

In an apartment complex, the number of people aged 51 years and above is 30 and there are at most 39 people whose ages are below 51 years. The average age of all the people in the apartment complex is 38 years. What is the largest possible average age, in years, of the people whose ages are below 51 years?

  1. 27
  2. 28
  3. 26
  4. 25

Quant Sets

If among 200 students, 105 like pizza and 134 like burger, then the number of students who like only burger can possibly be

  1. 93
  2. 26
  3. 23
  4. 96

Geometry

In a circle, two parallel chords on the same side of a diameter have lengths 4 cm and 6 cm. If the distance between these chords is 1 cm, then the radius of the circle, in cm, is

  1. √12
  2. √14
  3. √13
  4. √11

Mixtures Alligation

A trader sells 10 litres of a mixture of paints A and B, where the amount of B in the mixture does not exceed that of A. The cost of paint A per litre is Rs. 8 more than that of paint B. If the trader sells the entire mixture for Rs. 264 and makes a profit of 10%, then the highest possible cost of paint B, in Rs. per litre, is

  1. 26
  2. 16
  3. 20
  4. 22

Logarithms

If log log2 (5 + log3 a) = 3 and log5 (4a + 12 + log2 b) = 3, then a + b is equal to

  1. 67
  2. 40
  3. 32
  4. 59

Time Distance

Point P lies between points A and B such that the length of BP is thrice that of AP. Car 1 starts from A and moves towards B. Simultaneously, car 2 starts from B and moves towards A. Car 2 reaches P one hour after car 1 reaches P. If the speed of car 2 is half that of car 1, then the time, in minutes, taken by car 1 in reaching P from A is

Numbers

Given that x2018y2017 = 1/2 and x2016y2019 = 8, the value of x2 + y3 is

  1. 35/4
  2. 37/4
  3. 31/4
  4. 33/4

Time Work

A tank is fitted with pipes, some filling it and the rest draining it. All filling pipes fill at the same rate, and all draining pipes drain at the same rate. The empty tank gets completely filled in 6 hours when 6 filling and 5 draining pipes are on, but this time becomes 60 hours when 5 filling and 6 draining pipes are on. In how many hours will the empty tank get completely filled when one draining and two filling pipes are on?

Progressions

Let x, y, z be three positive real numbers in a geometric progression such that x < y < z. If 5x, 16y, and 12z are in an arithmetic progression then the common ratio of the geometric progression is:

  1. 3/6
  2. 3/2
  3. 5/2
  4. 1/6

Divisibility

56 - 1 is divisible by

  1. 5
  2. 13
  3. 31
  4. None of these

Divisibility

If n is any odd number greater than 1, then n(n2 - 1) is

  1. divisible by 24 always
  2. divisible by 96 always
  3. divisible by 48 always
  4. None of these

Divisibility

Let N = 553 + 173 - 723. N is divisible by

  1. both 3 and 17
  2. both 7 and 13
  3. both 3 and 13
  4. both 17 and 7

Remainders

After the division of a number successively by 3, 4 and 7, the remainders obtained are 2, 1 and 4 respectively. What will be the remainder if 84 divides the same number?

  1. 53
  2. 75
  3. 41
  4. 80

Remainders

When 2256 is divided by 17, the remainder would be

  1. 1
  2. 14
  3. 16
  4. None of these

Remainders Divisibility

What will be remainder when (6767 + 67) is divided by 68?

  1. 67
  2. 63
  3. 66
  4. 1

Remainders Divisibility

Find the minimum integral value of n such that the division 55n/124 leaves no remainder

  1. 124
  2. 123
  3. 31
  4. 62

Remainders Divisibility

Let k be a positive integer such that k+4 is divisible by 7. Then the smallest positive integer n, greater than 2, such that k+2n is divisible by 7 equals

  1. 7
  2. 5
  3. 9
  4. 3

Remainders

Let N = 1421 × 1423 × 1425. What is the remainder when N is divided by 12?

  1. 0
  2. 9
  3. 6
  4. 3

Remainders

On dividing a number by 5, we get 3 as remainder. What will the remainder when the square of the this number is divided by 5?

  1. 0
  2. 1
  3. 2
  4. 4

Remainders

What is the sum of all two-digit numbers that give a remainder of 3 when they are divided by 7?

  1. 676
  2. 777
  3. 683
  4. 666

Remainders

The remainder obtained when a prime number greater than 6 is divided by 6 is

  1. 1 or 3
  2. 1 or 5
  3. 3 or 5
  4. 4 or 5

Remainders

The remainder when 784 is divided by 342 is

  1. 0
  2. 1
  3. 49
  4. 341

Remainders

The smallest number which when divided by 4, 6 or 7 leaves a remainder of 2, is

  1. 86
  2. 80
  3. 62
  4. 44

Remainders

What is the remainder when 496 is divided by 6?

  1. 0
  2. 2
  3. 3
  4. 4

Remainders

If x = (163 + 173 + 183 + 193), then x divided by 70 leaves a remainder of

  1. 0
  2. 1
  3. 35
  4. 69