Sainik School Entrance Exam 2019 Solved Paper

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Question : 13 of 150

Marks: +1, -0

The ages of

A

and

B

are in the ratio of

5: 7

. Four years from now the ratio of their ages will be

3: 4

. The present age of

B

is

20 years
28 years
15 years
21 years

Solution:

(b) Suppose the age of

A

and

B

are

5y

and

7y

respectively.
Then, after 4 years

{5y+4}/{7y+4} = 3/4

20y+16 = 21y+12

21y+20y = 16 - 12

y=4

∴ Present age of B =

7y

= 7×4 = 28

years.

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