SOLUTION: A rectangular platform for a concert has a perimeter of 640 feet. Suppose that the length of the platform is three times the width. What are the dimensions of the platform? Thank Y

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Question 277221: A rectangular platform for a concert has a perimeter of 640 feet. Suppose that the length of the platform is three times the width. What are the dimensions of the platform? Thank You
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
P=perimeter
L=length
W=width
GIVEN: P=640 L=3W P=2L+2W
USE SUBSTITUTION
P=2L%2B2W solve for W
640=2%283W%29%2B2Wdistribute
640=%286W%29%2B2Wadd
640=8Wdivide
highlight%2880=W%29
___
if W=80 then:
L=3W
L=3%2880%29
highlight%28L=240%29