Average age of a family of 6 ,members, 4 ,year ago was 25 ,years. Mean while a child was born in thi

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The average age of a family of $6 \,members\, 4 \,year$ ago was $25 \,years.$ Mean while a child was born in this family and still the average age of the whole family is same today. The present age of the child is in $years$ $?$

A

$2$

B

$1.5$

C

$1$

D

$3$

Solution

Total present age of a family of 6 members

$=25 \times 6+4 \times 6=174$

Total present age of a family including child $\,=\,25$ $\times$ $7$$=\,175\,$ years.

Age of child is $=175-174=1$ year.

Standard 13

Quantitative Aptitude

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