The average age of 120 members of a society is 60 7 years By addition of 30 new members the average ...........

Quantitative Aptitude (CGL) Average

The average age of 120 members of a society is 60.7 years. By addition of 30 new members, the average age becomes 56.3 years. What is the average age (in years) of newly joined members?

36.5

37.2

38.3

38.7

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Explanation:

Sum of the ages of 120 members is
120*60.7
Sum of the ages of 150 members is
150*56.3
Sum of the ages of 30 new members is
150*56.3 - 120*60.7 = 1161
Average age of these members is
1161/30 = 38.7 years.