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.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 10 years.
Let the daughter's present age be x years and the father's present age be 3x years.
So, (3x + 10)/(x + 10) = 2
⇒ 3x + 10 = 2x + 20
⇒ 3x - 2x = 20 - 10
⇒ x = 10
Therefore, the daughter's present age is 10 years.