A model airplane is built to a scale of 1in.:12ft. If the model plane is 11 inches long, find the length of the actual plane, rounded to the nearest foot?

length-actual-plane

#1

A model airplane is built to a scale of 1in.:12ft. If the model plane is 11 inches long, find the length of the actual plane, rounded to the nearest foot?

Answer:

This is a simple ratio problem. Since both units for the model is inches and both of the plane is feet, we don’t need to do any conversions. The ratio is simply

before/after = before/after

Substitute

1/11 = 12/x

Cross Multiply

1x = 11(12)

x = 132

132 feet