A man is four time as old as his son. How old is the man if the sum of their ages is 60?

A man is four time as old as his son. How old is the man if the sum of their ages is 60?

Let the son's age be a. Then the man's age is 4a.

If the sum of their ages is 60, we have:
a + 4a = 60

To solve this equation for a, we type it in our math engine and we get:
a = 12

Therefore, the man's age is:
4(12) = 48