Question

The average age of a family of 6
members is 22 years. If the age of the
youngest member be 7
years. What was
the average age of family at the birth
of youngest
member
a)15
b) 12
c) 18
d)21​

Answer 1

Answer:

c) 18

Explanation:

Total age of 6 members = 22*6 = 132 years.

Total age of 5 members excluding youngest member = 132–7 = 125 years.

At the birth of youngest member, everyone's of the families age will be reduced by 7 years. So total age reduced = 5*7 = 35 years. Therefore theirs total age = 125–35 = 90 years.

Hence average of theirs age = 90 ÷ 5 = 18 years