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In a class there are 72 boys whose average age is decreased by 2.5 months, when 1 boy aged 30 years is replaced by a new boy. Find the age of the new boy.
15 years
16 years
17 years
18 years
effect on tatal age of the classs= 72x2.5=180 or 15 years decrease so the age of new boy will be 30-15=15 years
By: MIRZA SADDAM HUSSAIN ProfileResourcesReport error
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