The proportion of the ages of father to that of son is 7 3 today After five years this rate would be...........

Quantitative Aptitude ( CCS) Problems based on Ages

The proportion of the ages of father to that of son is 7:3 today. After five years, this rate would be 2:1. How many years old should the father was at the time of son’s birth?

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Explanation:

Let, Ages of father and Son today is “7A” and “3A” years correspondingly.
Then, 5 years, then we get,
{ (7A + 5)/(3A + 5) }= (2/1)
A = 5
The age of father today is 35 years.
Ages of son’s today is 15 years.
At the time of son’s birth, father have been (35-15) = 20 years.