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4.Average

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$3 \,years$ ago the average age of a family of $5 \,members$ was $17 \,years,$ with the birth of a new baby, the average age of six members remains the same even today. Find the age of the new baby in $year$.

A

$2$

B

$3$

C

$5$

D

$7$

Solution

total present age of $5$ members $=17 \times 5+3 \times 5=100$

total present age including new baby $=17 \times 6=102$

Age of new baby $=102-100=2$ years.

Std 13

Quantitative Aptitude

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