Question

the average of 40 boys is 16.95 years.by the addition of a new boy, the average of the class is raised to 17 years.what is the age of the new boy ?

Answer 1

Answer:

age of new boy is 19 year

Answer 2

Answer:

Step-by-step explanation:

Here I have used logic based approach. It can be also solved by formula based approach

Average of 40 boys is 16.95

When the new boy enters average increases by 0.05 this means the new boy have brought 17 kgs of its own and 0.05 kgs for 40 boys

So 17 + 0.05* 40 = 19