Rectangle with a perimeter of 60 feet has a length and width in a ratio of 3: 2. what are the length and width?

Total parts:
3+2= 5

Half of perimeter (or the sum of the length and the width) is:
60 ft/2= 30 ft

Each part is:
30 ft/ 5 parts= 6 ft/part

The length costs 3 parts, and the length is:
6 ft/ 1 part* 3 parts= 18 ft.

The width costs 2 parts, and the width is:
6 ft/ 1 part* 2 parts= 12 ft.

The length and the width of the rectangle are 18 ft and 12 ft respectively~