BPSC 65th Re Prelims Exam 17 Feb 2020 Solved Paper

Question : 143 of 150

Marks: +1, -0

The average age of a father and a mother in a family is 36 years. The average age of a father, mother and their only daughter is 28 years. How old is the daughter?

11 years
12 years
13 years
14 years
None of the above/More than one of the above

Validate

Solution:

Avg age of Mother and Father

=36

and Father

=36

∴

Total age of mother and father

=36 × 2=72

Average age of mother, father and daughter

=28

∴

Total age of mother, father and daughter

=28 × 3=84

Hence, age of daughter

=84-72

=12

years

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