The average of a group of men is increased by 5 years when a person aged of 18 years is replaced by a new person of aged 38 years. How many men are there in the group?

A. 3

B. 4

C. 5

D. 6

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Solution(By Apex Team)

Let N be the no. of persons in the group. Required number of person is given by; Member in group × aged increased = difference of replacement $\begin{array}{l}\text{N × 5 = 38 – 18}\\ \text{Or, 5N = 20}\\ \text{Or, N = 4}\end{array}$

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