The average age of a group of 20 men is 22 years If two men whose age are 24 and 31 years respective...........

Quantitative Aptitude ( CCS) Problems based on Ages

The average age of a group of 20 men is 22 years. If two men whose age are 24 and 31 years respectively join the group, the average age of new group increase or decrease by

No increment , no decrement

increase by 0.5 year

decrease by 0.5 year

increase by 1 year

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Explanation:

Solution:
When 2 new people join if the sum of their age is 44 then the average will not change, but the sum of age of new people is 55 i.e increase of 11
hence avg increases by 11/22=0.5 years.