A father is 4 times as old as his son. In 20 years, the father will be twice as old as his son. How old is the son now?
- 10
- 20
- 30
- None of these
Explanation
Let son's age now = x
Father's age now = 4x
After 20 years:
Son = x + 20
Father = 4x + 20
According to question:
4x + 20 = 2 * (x + 20)
4x + 20 = 2x + 40
4x - 2x = 40 - 20
2x = 20
x = 10
Son is 10 years old now (Father is 40).
Last verified on 07-10-2026
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