If a 12 years old boy is replaced by a new boy, then the average age of 18 boys increases by 1.5 years.
What is the age of the new boy?
1
35 years
2
37.5 years
3
43 years
4
39 years
If a 12 years old boy is replaced by a new boy, then the average age of 18 boys increases by 1.5 years.
What is the age of the new boy?