My father is 21 years older than me. In 12 years time, his age will be twice mine. How old am I now?

Options

A. (a) 9 years
B. (b) 8 years
C. (c) 10 years
D. (d) 11 years

Answer

A

Explanation

Suppose my age = x years My father.s age = x + 21 years Again,
`2(x+12)=x+21+12`
or, `2x+24=x+33`
or, `x=33-24=9` years