The present age of a man is four times that of his son. In five years, the man’s age will be three times that of his son. Find the present age of the son?
Answer: 10 years
Explanation
Let the son's present age be x.
The man's present age = 4x
In 5 years:
Son's age = x + 5
Man's age = 4x + 5
According to the problem:
4x + 5 = 3(x + 5)
4x + 5 = 3x + 15
4x - 3x = 15 - 5
x = 10
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