# QA – Placement Quizzes | Age | Question 7

A boy is older than girl by 7 years. If the ratio of ages of boy:girl is 9:7, what is the age of boy?**(A)** 30 years**(B)** 20 years**(C)** 31.5 years**(D)** 25.5 years**Answer:** **(C)****Explanation:** say age of boy = b

age of girl = b-7

b:b-7 = 9:7

7b = 9b -63

2b = 63

b= 31.5 years

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