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4.Average
easy
In a family, the average age of father and mother is $38\, year$ whereas the average age of father, mother and their only daughter is $28\, year.$ Then, the age of the daughter is? (in $year$)
A
$5$
B
$6$
C
$8$
D
$10$
Solution
Sum of the age of father and mother $=38 \times 2=76$ years.
Sum of the age of father Mother and daughter $=28 \times 3=84$ years
Age of daughter $=84-76=8$ year
Standard 13
Quantitative Aptitude
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