Gujarati
Hindi
4.Average
medium

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?

Solution

Total age of a family of $6$ members $=22 \times 6=132$ years

Total age of the family at birth of youngest member

$=132-7 \times 6=132-42=90$ years

Average age $=\frac{90}{5}=18$ years.

Std 13
Quantitative Aptitude

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