Question

A man is 42 years old and his son is 12 years old in how many years will the age of the sun be half the age of the man at that time

Answer 1

Given that, Man's age is 42 years, and
His son's age is 12 years,

Let after x years, the age of the son will be Half the Age of man,

After x years, 
The man's age will be (42+x),
and the son's age will be (12+x),

According to the question,

(42+x) = 2(12+x),

=> 42 + x = 24 + 2x,
=> 18 = x,

So, Therefore after 18 years, The son's age will become half of Man's age !

Hope you understand, Have a great day !