Question 972203
27-x +x-8+3x+11=3x+30=3(x+10)
average is (3/3)(x+10) =
x+10

y=x+10
2y= 2x+20
(2y/3) = (2x+20)/3

The average of those is (1/2)[ (2x+20) +(2x+20/3]
Common denominator of 3 for what is inside parentheses
(1/2)(1/3)[6x+60+2x+20]

(1/6) (8x + 80)
(4/3) (x + 10)

average of 2y and 2y/3 = 8y/3/2= (4/3) y

but y= x+10
(4/3)y= (4/3) (x+10)