Question

1. There are 8 members in family. 10 years ago the total age of all members was â€x’, after 3 years a member of age 60 died and a new child is born. Again after 3 year a member of age 60 died and a new child born. Find the current average of age of all members in terms of â€x’.

Answer 1

10 years before total age of 8 family members = x

after 3years total age of 8 family memeber = x + 24 - 60 = x - 36

Again 3years total age of 8 family members = x - 36 + 24 - 60 = x - 72

after 4more years ie. present age of 8 members = x - 72 + 32 = x - 40

current average age of all members = (x-40)/8

                       or

after 10 years age of 8 members = x + 80

two of 60 years died and same time two newborn(0years) joined

= x + 80 - 120 = x - 40

Current Average of all members = (x-40)/8