When a couple was married their average age was 22 years When their first child was born the average...........

Quantitative Aptitude ( CCS) Problems based on Ages

When a couple was married, their average age was 22 years. When their first child was born, the average age of all the three became16 years. When their second child was born, the average of all 4 became 15 years. Find the average age of couple at the time when their second child was born.

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Explanation:

Solution:
At the time of marriage total age of couple=44
when 1st child is born total age of three=16*3=48
Difference=48-44=4 years (Child is of 0 years hence this is the sum of age incrase of couple)
When second child is born sum of age=4*15=60 years
=> increase of 12 years after first child, means age of husband, wife and first child increased by 4 years each. SO increase in husband and wife total age = 8 years
total increase =4+8=12
total age=44+12=56; average=56/2=28 years