Question

The average age of a family of 5 members is 20 years. If the age of the youngest member be 10 years then what was the average age of the family at the time of the birth of the youngest member? Option 1 : 12.5 option 2 : 13.5 option 3 : 14 option 4 : 15

Answer 1

Answer:

Option(D) is correct

At present the total age of the family = 5×20=100

The total age of the family at the time of the birth of the youngest member:

=⎡⎣⎢⎢100−10age of youngest−(10×4)10 years × remaining family members⎤⎦⎥⎥=50

Therefore, average age of the family at the time of birth of the youngest member :

=504

=12.5