Question

The average age of a group of 4 friends is 36 years. The youngest friend amongst them is 6 years old. What was the average age of the group at the time of the birth of the youngest friend?

Answer 1

Solution :-

Total present age of the friend group

(4×36) = 144 years

Total age of the friend 6 years ago =

=> (144 - 6×4) = 120 years

At that time, the number of member = 4

Therefore Average age at that time = 120

120/4 = 30 years

==============

@GauravSaxena01

Answer 2

Answer:

Step-by-step explanation:

Solution :-

Total present age of the friend group

(4×36) = 144 years

Total age of the friend 6 years ago =

=> (144 - 6×4) = 120 years

At that time, the number of member = 3 only because at the time birth of 4th person

Therefore Average age at that time = 120

120/3 = 40 years