The perimeter of a rectangle is 54 inches.
Its length is 15 inches.
What is the width (w)?

12

Step-by-step explanation:

if the perimeter is 54, and the length is 15,

first double the length (to include both sides of the rectangle):

15(2)=30

subtract that by 54:

54-30=24

to find the width we would divide 24 by 2, because 24 represents both sides of the rectangle:

24/2=12

the width is 12.