The area of a rectangle is 450 square inches if the length of the rectangle is 24 inches what is is the width?

In getting the area of a rectangle, the formula is length x width.
Given the length 24 and the area 450:
450 divided by 24 will give you 18.5.

length - 24
width - 18.5
area - 450

Checking:
24 x 18.5 = 450