Question

In a group of 7 people, the average age is found to be 17 years. Two more people joined with an average age 19 years. One person left the group whose age was 25 years. What is the new average age of the group?

A.
17.5 years
B.
16.5 years
C.
18 years
D.
16 years

Accepted Answer

D. Initial total age = $7 	imes 17 = 119$. Total age after 2 people join = $119 + (2 	imes 19) = 119 + 38 = 157$. Total age after 1 person leaves = $157 - 25 = 132$. New number of people = $7 + 2 - 1 = 8$. New average age = $\frac{132}{8} = 16.5$ years.

Average Age Calculation

Explanation

Practise this under exam conditions