A) 20 years
B) 15 years
C) 10 years
D) 8 years
Correct Answer: B
Solution :
Total age of remaining 29 boys \[=\text{ }30\times 15-20\Rightarrow 450-20=430\] Suppose the age of two new boys be x years and (x + 5) years then, \[430+x+x+\text{ }5=15\times 31\] \[2x=465-435=30\Rightarrow ~x=\mathbf{15years}\] The age of younger boy = 15 yearsYou need to login to perform this action.
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