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?
Answer & explanation
Correct answer: option 3
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