Question

Five years ago mean age of a family was 25 years.What is the present mean age of the family?​

Answer 1

Explanation:

Let the number of family members be

′

x

′

the average age of the family members 5 years ago is 25 years

so the sum of age of all family members 5 years ago =25x

the sum of age of these family members now and after 5 years elapsed =25x (these added 5 years * no of family members) =25x+5x=30x

Sum of ages =30x

no. family members be x

Therefore, current, average age = sum of ages/no. of members =

x

30x

=30