The flag of OverlySandy Beach always has to be in a 7 : 8 scale. If you have enough fabric to make the item have 40 millimeters as its length, what does the width of the flag need to be in millimeters?

Let's assume that 7 corresponds to width and 8 with length.

Step 1: Set up proportions as such -

^{Length}/_{width} = ^{8}/_{7} = ^{40}/_{y}

"y" is the unknown width

Step 2: Cross multiply

280=8y

y=35

Hence width is 35 mm