Large family

The average age of all family members (children, mother, father, grandmother, grandfather) is 29 years. The average age of parents is 40 years, grandparents 66 years and all children are 5 years. How many children are there in this family?

Correct result:

n =  4

Solution:

29•(n+2+2) = 5n+2•40+2•66

29•(n+2+2) = 5•n+2•40+2•66

24n = 96

n = 4

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