Question

The average age of Raman and his friends increased by 5 when Raman was replaced by his elder brother Karan whose age
was 38 years. If Raman's age is 18 years, then how many people are there in the group?​

Answer 1

Answer:

Let the number of Karan's friends be 'n' , their weight be 'x' kgs and inital average be 'y'.

Now, (18 + x) / n + 1  = y

and (38 + x) / n + 1 = y + 5

Solving these two equations, we get n = 3

Therefore, total members in the group is 4