Q7
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
AnswerC.
5
D.
6
E.
7
Answer: Option B
Solution
Answer: Option B
Solution:
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
N × 5 = 38 - 18
Or, 5N = 20
Or, N = 4