The average age of a man and his son is 60 years. The ratio of their ages is 13 : 7, respectively. What is the son's age?

40 years  41 years  42 years  43 years

42 years

Sum of age of man and his son = 60 × 2 = 120 years ATQ , Age of Man : Age of Son  = 13 : 7 ( 13 + 7 )R = 120 20R = 120 R = 6 Age of Son = 7 × 6 = 42 years