A man is 4 times as old as his daughter. In 20 years, he will be twice as old as she will be then. How old is the daughter now?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 10.
Let daughter’s present age = x
Man’s present age = 4x
After 20 years:
Daughter’s age = x + 20
Man’s age = 4x + 20
Daughter’s present age = 4x + 20 = 2(x + 20)
4x + 20 = 2x + 40
2x = 20
x = 10