The ratio of ages of a father and his son his son was 5 : 1. What is the age of the son after five years, if the ratio of their ages is 3 : 1 by this time?

The ratio of ages of a father and his son his son was 5 : 1. What is the age of the son after five years, if the ratio of their ages is 3 : 1 by this time? Correct Answer 10

Father = 5x Son = x So, ( 5x + 5) : ( x + 5) = 3 : 1 5x + 5)/ x + 5 = 3/1 5x + 5 = 3x + 15 2x = 10 x = 5 After 5 years son age = 5 + 5 = 10
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