Question

A father and his son are $50$ years and $20$ years old respectively$.$ Find the ratio of father's age to his son's age when the son was $10$ years old$.$

Answer 1

Step $1:$ To find the ratio of the father's age to his son's age when the son was $10$ years old.

Given the present age of father $=50$ years

present age of son's $=20$ years

Step $2:$ Find the age of the father when son was $10$ years old

$10$ years ago father age was $=40$ years

$10$ years ago son age was $=10$ years

Step $3:$Now find the ratio of the father's age to his son's age

Required Ratio $=40:10$

Step $4:$ Convert ratio into a fraction and write its simplest form

$=\frac{40}{10}$

$=\frac{4}{1}$

Hence, the ratio of father's age to his son's age when son was $10$ years old is $4:1$