Five years ago average age of husband and wife was 23, years. Today average age of husband, wife and

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Five years ago the average age of husband and wife was $23\, years.$ Today the average age of husband, wife and child is $20 \,years.$ How old is child in $years$ ?

A

$3$

B

$4$

C

$12$

D

$2$

Solution

Sum of the present age of Husband and wife

$=23 \times 2+5 \times 2=56 \text { years }$

Sum of the present age of Husband, wife and child

$=20 \times 3=60$

Age of child $=60-56=4$ $years.$

Standard 13

Quantitative Aptitude

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