Marcus built a model car that is 4 inches wide. What scale was used to build the car if the actual width of the car is 6 feet?

4in : 6ft = 4in : 72in = 4:72 = 1:18

To determine the scale used to build the model car, we can use the ratio of the model car's width to the actual car's width.

First, let's convert the actual width from feet to inches, since the model car's width is given in inches:
Actual width = 6 feet * 12 inches/foot = 72 inches.

Next, we can calculate the scale using the ratio of the model car's width to the actual width:
Scale = Model car's width / Actual width.

Plugging in the given values:
Scale = 4 inches / 72 inches.

Now we can simplify the ratio:
Scale = 1/18.

Therefore, the scale used to build the car is 1:18.

To determine the scale used to build the model car, we need to compare the size of the model car to the size of the actual car.

First, we need to convert the width of the actual car from feet to inches, since the width of the model car is given in inches. There are 12 inches in a foot, so the width of the actual car is 6 feet * 12 inches/foot = 72 inches.

Next, we divide the width of the model car (4 inches) by the width of the actual car (72 inches):

Scale = width of model car / width of actual car
Scale = 4 inches / 72 inches

Simplifying this fraction, we get:

Scale = 1/18

Therefore, the scale used to build the model car is 1:18. This means that each inch on the model car represents 18 inches on the actual car.