15. The ratio between the present ages of A and B is 5 : 3 respectively. The ratio between A?s age 4 years ago and B?s age 4 years hence is 1 : 1. What is the ratio between A?s age 4 years hence and B?s age 4 years ago ?

A.1 : 3

B.2 : 1

C.3 : 1

D.4 : 1

16. Ten years ago, A was half of?B in age. If the ratio of their present ages is 3 : 4, what will be the total of their present ages ?

A.20 years

B.30 years

C.45 years

D.None of these

17. A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 27, then how old is B ?

A.7

B.8

C.9

D.10

18. A man is 24 years older than his son. In two years, his age will be twice the age of his son. The present age of the son is :

A.14 years

B.18 years

C.20 years

D.22 years

19. Eighteen years ago, a father was three times as old as his son. Now the father is only twice as old as his son. Then the sum of the present ages of the son and the father is :

A.54

B.72

C.105

D.108

20. A person?s present age is two-fifth of the age of his mother. After 8 years, he will be one-half or the age of his mother. How old is the mother at present ?

A.32 years

B.36 years

C.40 years

D.48 years

21. Tanya?s grandfather was 8 times older to her 16 years ago. He would be 3 time of her age 8 years from now. Eight years ago, what was the ratio of Tanya?s age to that of her grandfather ?

A.1 : 2

B.1 : 5

C.3 : 8

D.None of these

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