Hi,

A man is 3 times as old as his son.

Let x represent the son's age and 3x the father's age

Question states***The sum of their ages is 48 years

 x + 3x = 48

Solving for x

 4x = 48

  x = 12, the age of the son.  The father is 36

CHECKING our Answer***

  12 + 36 = 48 

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