20 years ago, Antony's age was 1/2 of what his age now is. What is his age now?

Options

A. 20 years
B. 40 years
C. 35 years
D. 30 years

Answer

B

Explanation

Suppose the present age of Antony is x years.
20 years ago his age was `(x)/(2)` years.
Now, `x-20=(x)/(2)`
`implies2x-40=x`
`implies2x-x=40`
`:.x=40` years