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प्रश्न
A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 yr, that of the parents is 35 yr and that of the grandchildren is 6 yr. What is the average age of the family?
विकल्प
`28 4/7` yr
`31 5/7` yr
`32 1/7` yr
None of these
MCQ
उत्तर
`31 5/7` yr
Explanation:
Required average
= `((67xx2+35xx2+6xx3)/(2+2+3))`
= `((134+70+18)/7) = 222/7 = 31 5/7` yr
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Average and Age
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