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- Quantitative Aptitude
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
