Question

The average of 10 numbers is 7 if each number is multiplied by 12 then average of be set of numbers is how much

Answer 1

Let the numbers be a,b,...,j

A/Q

(a+b+c+...+j)/10=7

a+b+...+j=70----i

If each number is multiplied by 12 then the numbers will be 12a, 12b,...,12j

New average

=(12a+12b+...+12j)/10

={12(a+b+...+j) }/10

=(12*70)/10--------From i

=12*7

=84