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The flag in a 7 : 8 scale. fabric to make 40 millimeters as its length, whats the width of the flag in millimeters?

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?

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Rizul N. | UNC-CH Grad For Math and Science TutorUNC-CH Grad For Math and Science Tutor
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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