Quantitative Aptitude :: Problems on Ages - Discussion

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Explanation:
Let the age of son = S years and the age of father = F years.
According to the question,
=> F = 3*S.
=> F = 3S.

After 5 years,
=> (F+5) = 2.5 * (S+5).
=> 3S + 5 = 2.5S + 12.5 [put F=3S]
=> 0.5S = 7.5
=> S = 15
Hence, the age of son = 15 years.