Question

The present average age of a family of eight members is 40 years. If the present age of the youngest member in the
family is twenty years. then what was the average age of the family at the time of the birth of the youngest member ? (Assume
no death occurred in the family since the birth of the youngest).

Answer 1

Answer:

Present total age of the members = 26(5) = 130 years.

Present age of the youngest member = 10 years

Present total age of the remaining four members = 130 -10 = 120 years

Their average age at the time of the birth of the youngest member = [120−(4×10)]4 = 30 - 10 = 20 years.

Answer 2

Answer:

23 years or 22 years because the answer is in decimal.

Step-by-step explanation:

Present total age of members = 40(8)

= 320 years

Present age of the youngest member = 20 years

Present total age of the remaining 7 members = 320-20

= 300 years

Their average age at the time of birth of the

youngest number = (300 - ( 7×20)) / 7

= 22.85

So the answer is either 22 or 23....Check with the options.