Symbiosis National Aptitude Test SNAP 2012 Paper

Let the present age of father = x year and Son’s present age = y years.
5 years ago, father’s age = x – 5 and Son’s age = y – 5
According to the question,
x – 5 = 5 (y – 5) .... (1)
and x = 3y ....(2)
∴ From eqn (1) and (2), we have
y = 10 and x = 30 years.
Hence, father’s present age = 30 years.