SSC CGL 9 Aug 2017 Shift 1 Paper

Question : 56 of 100

Marks: +1, -0

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

Validate

Solution:

The average age of newly joined members

=[(120 + 30) × 56.3 -1 2 0 × 60.7] /30

={8445 - 7284}/30=1161/30=38.7

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