Three years ago, the age of a father was three times the age of his son. If the sum of their current ages is 70 years, what is the present age of the son?
- 19 years
- 20 years
- 25 years
- None of these
Explanation
Let son's current age be x and father's current age be y.
x + y = 70 ... (1)
Three years ago,
son's age = x - 3
father's age = y - 3
Given y - 3 = 3(x - 3)
y - 3 = 3x - 9
y = 3x - 6 ... (2)
Putting (2) in (1):
x + 3x - 6 = 70
4x = 76
x = 19
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