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4.Average
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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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