Question

A father is presently 3 times his daughter's age. After 10 years he will be twice as old as her. Find the daughter's present age.

• A. 15 years
• B. 5 years
• C. 20 years
• D. 10 years

Answer 1

Answer:

D. 10 years

ratio of present age age of daugther and father is $1:3$

after 10 years

$\frac{x+10}{3x+10}=\frac12$

$2x+20=3x+10$

$x=10$