A's mother was four times as old as A, ten years ago. After ten years she will be twice as old as A. Then A's present age is?
- 10 years
- 30 years
- 20 years
- None of these
Explanation
Let A's present age = x
10 years ago:
Mother's age = 4 _ (x - 10)
After 10 years:
Mother's age = 2 _ (x + 10)
Difference between those two mother ages is 20 years:
4(x - 10) + 20 = 2(x + 10)
4x - 40 + 20 = 2x + 20
4x - 20 = 2x + 20
2x = 40
x = 20 years
Last verified on 12-10-2026
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