1.

Average age of 5 children of the family is 11 years. Average age of their parents and grandmother is 35 years. Find the average age of all the eight members of the family?1). 10 years2). 20 years3). 30 years4). 25 years

Answer»

We know that, Average = Sum total of AGE of all the Members / Total no. of members

? According to Question

⇒ 11 = Sum total of Age of 5 children / 5

⇒ Sum total of age of 5 children = 11 × 5 = 55

Similarly, according to Question

⇒ 35 = Sum total of Age of parents & GRANDMOTHER / 3

⇒ Sum total of age of Parents & Grandmother = 35 × 3 = 105

⇒ Total sum of ages of 8 members (5 Children, parents, grandmother) = 55 + 105 = 160

⇒ Average = 160/8 = 20


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