What should be the width of an art student's model if the length is 42in and the length is 2.4 times the width?

A: 17.5in
B: 20.5in
C: 83.6in
D: 100.8in

To find the width of the art student's model, we can start by setting up a simple equation based on the given information.

Let's say the width of the model is represented by the variable "x". We are given that the length is 42 inches and that the length is 2.4 times the width.

Using that information, we can write the equation:

Length = 2.4 * Width

Substituting the given values:

42 = 2.4 * x

To solve for "x", we need to isolate the variable on one side of the equation.

Dividing both sides of the equation by 2.4:

42/2.4 = x

The value of x is approximately 17.5 inches, which means that the width of the art student's model would be 17.5 inches.

Therefore, the correct answer is A: 17.5 inches.