SOLUTION: perimeter of a rectangle is 48cm. The width is one third the length. Determine the dimensions of the rectangle. 

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Question 1008780: perimeter of a rectangle is 48cm. The width is one third the length. Determine the dimensions of the rectangle. 
Found 2 solutions by fractalier, MathLover1:
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Perimeter P = 2L + 2W = 48 and W = (1/3)L (or L = 3W)
Now substitute that into your formula and get
2(3W) + 2W = 48
6W + 2W = 48
8W = 48
W = 6 cm
L = 3W = 18 cm

Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

perimeter of a rectangle is P=48cm.
The width W is one third the length L.
W=L%2F3

P=2L%2B2W
48cm=2L%2B2L%2F3
48cm=6L%2F3%2B2L%2F3
48cm=8L%2F3
48cm%2A3=8L
L=%2848cm%2A3%29%2F8
L=144cm%2F8
L=18cm
now find W=L%2F3
W=18cm%2F3
W=6cm