SOLUTION: the width of a rectangle is one-third of the length. if the perimeter is 40cm, find the dimensions of a rectangle.

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Question 339795: the width of a rectangle is one-third of the length. if the perimeter is 40cm, find the dimensions of a rectangle.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let length be 3x
width will be x
..
Perimeter P = 2*(L+W)
40=2*(3x+x)
40=8x
x=5 cm the width.
length = 3x = 3*5 =15cm
...
CHECK
15+15+5+5=40