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The ratio of present ages of A and B is ...

The ratio of present ages of A and B is 5: 7. If the age of B after 10 years will be 31 years, then what is the present age (in years) of A?

A

10

B

15

C

25

D

35

Text Solution

Verified by Experts

The correct Answer is:
B
Suppose present age of A =5 x years
Present age of B=7x years
According to question,
`7x+10=31`
`implies7x=31-10`
`impliesx=(21)/(7)=3`
`:.` Present age of A =5x years
`=5xx3=15` years
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