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An airplane has a length of 85.4 feet. A scale model of the airplane has a length of 12.2 inches and a wingspan of 12.5 inches. What is the wingspan (in feet) of the actual airplane?

 Sep 1, 2022
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Using simple ratio basics, we have \(\frac{85.4}{12.2}=\frac{x}{12.5}\). Multiplying by \(\frac{10}{10}\) we get \(\frac{854}{122}=7=\frac{10x}{125}\)

 

Multiplying \(125\) and dividing by \(10\) gets us \(x=87.5\), thus the wingspan of the plane is \(87.5\) feet.

 

Note that the inches and feet didn't really matter, since they all cancelled out anyway. 

 Sep 3, 2022

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