A family consists of two grandparents, three parents and four grandchildren. The average age of the grand parents is 65 years, that of the parents is 32 years and that of the grand children is 8 years. What is the average age of the family?
Given 2 grandparents average as 65 so sum of their ages=65*2=130 years
Also given 3 parents average as 32 so sum of their ages=32*3=96 years
Also given 4 grandchildren average as 8 so sum of their ages=8*4=32 years
Total sum of ages=130+96+32=258 years
Average=258/9
=86/3 years
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