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.

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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.

A15 years

B5 years

C20 years

D10 years

Answer:

D. 10 years

Read Explanation:

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

after 10 years

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

$2x+20=3x+10$

$x=10$

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