The average age of a family of 6 members is 22 years If the age of the youngest member be 7 years th...........

Quantitative Aptitude ( CCS) Average

The average age of a family of 6 members is 22 years. If the age of the youngest member be 7 years, then what was the average age of the family at the birth of the youngest member?

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Explanation:

Total age of all members = 6 x 22 = 132 years
7 years ago, total sum of ages = 132 – (6 x 7) = 90 years
But at that time there were 5 members in the family
Average at that time = 90 /5 = 18 years