Question

At present a father is 40 years older than his son. Twenty years ago, he was
five times older than his son. What is the present age of the son?​

Answer 1

Explanation:

Let present age of father is X

Present son age is X-30

After 5 years

Fathers age will be X+5

After 5 years son's age will be X-30+5=X-25

X+5=2(X-25)=2X-50

2X-X=50+5

X=55 years

Present age of father is 55 years.

Answer 2

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