You need to use the formula :
P= (2L+2W)
The information given is:
P=240
W= Width
L= W +64
Your equation should be written:
240 = 2W(2W+64)
240 = 4W+128
Subtract 128 from both sides
112 + 4W
Divide both by 4
W = 28
L = 28 + 64, which is 92
Answer: The width of the rectangle is 28 in, the length of the rectangle is 92 in.
Checkpoint: 28 + 28 + 92 + 92 = 240