Question 1006283
complement of x= 90-x
supplement of x=180-x
The sum of x+90-x+180-x=-x+270
average of those is (-x/3)+90
That equals 80
-(x/3)=-10
x=30

complement of x=60 ANSWER
supplement of x=150
Average of the 3 is (240/3)=80
B