Question

if the average of x, y and 9 is 12, what is the average of x+2, y-6 and 10?

Answer 1

Step-by-step explanation:

(x+y+9)/3=12

x+y=(12×3) -9

x+y=27 _(equation 1)

now,

=(x+2+y-6+10)/3

= (x+y+6)/3 _[ from equation 1 (x+y=27)]

=27+6/3

=33/3

=11

therefore, the average of x+2,y-6 and 10 is 11