Question

The average age of 30 boys in a class is 15.2 years.Of 15 more boys join the class ,the average age of the class is reduced by half a year.The average age of newcomers is

Answer 1

Answer:

13.7 Years

Step-by-step explanation:

The avg age of 30 boys=15.2

so sum of ages=15.2*30=456

Let the sum of ages of new 15 boys=15x

then total age of  45 boys=456+15x

avg age=(456+15x)/45=15.2-0.5=14.7

456+15x=14.7*45

15x=661.5-456=205.5

15x=205.5

average age new boys

x=205.5/15=13.7 Years

=