Question

A model is built to a scale of 1 ft:87ft. If a model airplane is 3 feet long,how many feet long is the actual plane?

Answer 1

A model is built to a scale of 1 ft as 87 ft. That means that actual size is 87 times as mush as the model size.

Let the actual length be x ft.

Hence for model airplane which is 3 feet long , actual plane length must follow the equation

87/1 = x/3

x = 3*87 = 261 ft long.

Therefor the actual airplane is 261 ft. long.

Answer 2

If one foot of model is equal to 87 actual feet, then you'd multiply the 3 feet of model by 87 actual feet to get 261 feet.