Answer:
x=6 in
Step-by-step explanation:
The label covers four faces, and has a surface area of 6x3 on each face. 6x3=18, and 4x18=72, so the total surface area the label covers is 72in².
The label covers 80%, so 72in²=80%.
Therefore 0.9in²=1%
Therefore 90in²=100%
Now we know the total surface area of the box, 90in².
Total surface area = 2(area of square side) + 4(area of rectangular side)
90 = 2(3*3) +4(3x)
90=18+12x
12x=72
x=6 in
