1.

1). 23 years2). 24 years3). 26 years4). 27.5 years

Answer»

Given,

Average AGE of 2 GRANDPARENTS = 62 years.

Total age of grandparents = Average age × number of grandparents

Total age of grandparents = 62 × 2 = 124 years

& Average age of 2 PARENTS = 36 years.

Total age of parents = average age × number of grandparents

Total age of parents = 36 × 2 = 72 years

& Average age of 4 kids = 62 years.

Total age of kids = Average age × number of kids

Total age of kids = 9 × 4 = 36 years

Total age of all family members = 124 + 72 + 36 = 232

⇒ Average age of family = Total of age/Number of people in family

∴ Average age of family = 232/8 = 29 years



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