21.

In a library the ratio of story books and other books is 7 : 2 and there are 1512 story books. Due to the collection of some more story books the said ratio becomes 15 : 4. The number of story books collected is

• 108

• 100

• 205

• 205

A man divides his property so that his son's share to his wife's and wife's share to his daughter's are both as in the ratio 3 : 1. If the daughter gets ₹ 10,000 less than son, the value (in rupees) of the whole property is 

• ₹ 16,250

• ₹ 16,000

• ₹ 18,250

• ₹ 18,250

The third proportional of 12 and 18 is

• 3

• 6

• 27

• 27

Three numbers are in the ratio 2 : 3 : 4. If the sum of their squares is 1856, then the numbers are

• 8, 12 and 16

• 16, 24 and 32

• 12, 18 and 24

• 12, 18 and 24

Ram got twice as many marks in English as in Science. His total marks in English, Science and Maths are 180. If the ratio of his marks in English and Maths is  2 : 3, what are his marks in Science?

• 30

• 60

• 72

• 72

If ₹ 126.50 is divided among A, B and C in the ratio of 2 : 5 : 4, the share of B exceeds that of A by

• ₹ 36.50

• ₹ 35.50

• ₹ 34.50

• ₹ 34.50

If x runs are scored by A, y runs by B and z runs by C, then x : y = y : z = 3 : 2. If total number of runs scored by A, B and C is 342, the runs scored by each would be respectively.

• 144, 96, 64

• 162, 108, 72

• 180, 120, 80

• 180, 120, 80

₹ 900 is divided among A, B and C; the division is such that  of A's money =  of B's money =  of C's money. Find the amount (in ₹) received by A, B, C .

• 300, 400, 200

• 350, 450, 100

• 200, 300, 400

• 200, 300, 400

A and B earn in the ratio 2 : 1. They spend in the ratio 5 :3 and save in the ratio 4 : 1. If the total monthly savings of both A and B are ₹ 5,000 the monthly income of B is

• ₹ 7,000

• ₹ 14,000

• ₹ 5,000

• ₹ 5,000

The ratio of the sum of two numbers and their difference is 5 : 1. The ratio of the greater number to the smaller number is

• 2 : 3

• 3 : 2

• 5 : 1

• 5 : 1