SOLUTION: the length of a rectangle is 3 times its width. the perimeter of the rectangle is 72 cm. find the demensions of the retangle.

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Question 713744:
the length of a rectangle is 3 times its width. the perimeter of the rectangle is 72 cm. find the demensions of the retangle.
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
P=2L+2W
L=3W
72=2*3W+2W
72=6W+2W
72=8W
W=72/8
W=9 ANS. FOR THE WIDTH.
L=3*9=27 ANS. FOR THE LENGTH.
PROOF.
72=2*27+2*9
72=54+18
72=72