BANK IBPS Clerk (Pre + Mains) Mock Test 2024 Quantitative Aptitude Problem on Age

There are 30 students in a class with an average age of 18 years. If a new boy replaces a boy whose age is 24 years, then the new average becomes 17.5 years. What is the age of the new boy?

1
9 yrs
2
12 yrs
3
7 yrs
4
8 yrs
5
11 yrs
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