Answer:
13 years
Step-by-step explanation:
Solving algebraic equation.
Frame an equation with the given statements and then solve it.
Let Benjamin's age = x years
Mother is 3 times as old as Benjamin.
⇒ Age of mother = 3 *x
It is given that age of mother is 39 years.
3* x = 39
x = 39/3
x = 13
[tex]\sf \boxed{Benjamin's \ age = 13 \ years}[/tex]
