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A father is, at present, three times as ...

A father is, at present, three times as old as his son. Five years back, he was four times as old as his son. Find the age of his son.

A

12 years

B

15 years

C

18 years

D

20 years

Text Solution

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The correct Answer is:
B
Present age of the son is .x. years, his father.s age is 3x
Five year ago:
Son.s age = x - 5 and father.s age = 3x - 5.
`therefore ` 3x - 5 = 4(x - 5) or x = 15.
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