Question

the average of 4 numbers is 3o.what will be the average if each numbers is increased by 3,7,11 and respectively ​

Answer 1

Answer:

Step-by-step explanation:

let the x numbers be x1,x2,x3,x4

their average=30

x1+x2+x3+x4/4=30

x1+x2+x3+x4=120

if each number is incresed by 3,7,11and 15 resp

x1+3+x2+7+x3+11+x4+15/4

=x1+x2+x3+x4+36/4

=120+36/4=156/4=39