# Ratio and proportion aptitude questions

1. A and B together have Rs. 1210. If of A’s amount is equal to of B’s amount, how much amount does B have?
 A. Rs. 460 B. Rs. 484 C. Rs. 550 D. Rs. 664

Explanation:

 4 A = 2 B 15 5
 A = 2 x 15 B 5 4

 A = 3 B 2

 A = 3 B 2

A : B = 3 : 2.

 B’s share = Rs. 1210 x 2 = Rs. 484. 5

2. Two numbers are respectively 20% and 50% more than a third number. The ratio of the two numbers is:
 A. 2 : 5 B. 3 : 5 C. 4 : 5 D. 6 : 7

Explanation:

Let the third number be x.

 Then, first number = 120% of x = 120x = 6x 100 5

 Second number = 150% of x = 150x = 3x 100 2

 Ratio of first two numbers = 6x : 3x = 12x : 15x = 4 : 5. 5 2

3. A sum of money is to be distributed among A, B, C, D in the proportion of 5 : 2 : 4 : 3. If C gets Rs. 1000 more than D, what is B’s share?
 A. Rs. 500 B. Rs. 1500 C. Rs. 2000 D. None of these

Explanation:

Let the shares of A, B, C and D be Rs. 5x, Rs. 2x, Rs. 4x and Rs. 3x respectively.

Then, 4x – 3x = 1000

x = 1000.

B’s share = Rs. 2x = Rs. (2 x 1000) = Rs. 2000.

4. Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?
 A. 2 : 3 : 4 B. 6 : 7 : 8 C. 6 : 8 : 9 D. None of these

Explanation:

Originally, let the number of seats for Mathematics, Physics and Biology be 5x, 7x and 8x respectively.

Number of increased seats are (140% of 5x), (150% of 7x) and (175% of 8x).

 140 x 5x , 150 x 7x and 175 x 8x 100 100 100

 7x, 21x and 14x. 2

 The required ratio = 7x : 21x : 14x 2

14x : 21x : 28x

2 : 3 : 4.

5. In a mixture 60 litres, the ratio of milk and water 2 : 1. If the this ratio is to be 1 : 2, then the quanity of water to be further added is:
 A. 20 litres B. 30 litres C. 40 litres D. 60 litres

Explanation:

 Quantity of milk = 60 x 2 litres = 40 litres. 3

Quantity of water in it = (60- 40) litres = 20 litres.

New ratio = 1 : 2

Let quantity of water to be added further be x litres.

 Then, milk : water = 40 . 20 + x

 Now, 40 = 1 20 + x 2

20 + x = 80

x = 60.

Quantity of water to be added = 60 litres.