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4.Average
easy
The average age of a husband and wife, who were married $7 \,years$ ago, was $25\, years$ at the time of their marriage, Now, the average age of the family, including husband, wife and a child, born during the interval, is $22\, years.$ What is the present age of the child in $year$ ?
A
$4$
B
$2$
C
$3$
D
$5$
Solution
Present age of Husband and wife $=25 \times 2+7 \times 2=64$ years Present age of Husband wife and child $=22 \times 3=66$ years
Age of a child is $=66-64=2$ years.
Standard 13
Quantitative Aptitude