SOLUTION: a rectangle is three times as long as it is wide. The perimeter is 144 feet. Find the dimensions.

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Question 702873: a rectangle is three times as long as it is wide. The perimeter is 144 feet. Find the dimensions.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x is length. w is width.
Three times as long as it is wide: x=3w
Perimeter is 144: 144=2x+2w


Easiest way is substitute x from first equation into the second equation.
144=2(3w)+2w
144=8w
w=144/8=72/4=36/2=18.
w=18 means x=3(18)=36