The length of a rectangle is 4 cm less than 3 times the width The perimeter is 64cm Find the width and length?

If l is the length and w is the width, we get the following two equations:

l=3w-4

AND

2l+2w=64.

Plugging l from the first equation into the second equation and solving for w, we get:

2*(3w-4) + 2w=64

8w-8=64

8w=72

w=9

Using w=9 and the first equation to find l, we get:

l=3*9-4=23.