# <span lang="EN-GB

Let his present age be x

4 years ago his age = x-4 years

After 12 years his age = 12 + x years

According to the question

12 + x = 3(x-4)

12 + x = 3x-12

x-3x = -12-12

-2x = -24

x = 12

(divide by -2 on both the sides)

The present age of the person = 12 years

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