SOLUTION: the width of a rectangular frame is twice its length. what are the measures of the length and width if the perimeter is 200cm ?

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Question 484311: the width of a rectangular frame is twice its length. what are the measures of the length and width if the perimeter is 200cm ?
Found 2 solutions by stanbon, Little girl:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
the width of a rectangular frame is twice its length. what are the measures of the length and width if the perimeter is 200cm ?
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Let length be "x".
Then width = "2x".
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Perimeter = 2(length + width)
200 = 2(x + 2x)
100 = 3x
x = 33 1/3 (length)
2x = 66 2/3 (width)
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Cheers,
Stan H.

Answer by Little girl(7) (Show Source):
You can put this solution on YOUR website!
Length = a -> width= 2a
P of this rectangular = 200cm
-> (a+2a)2= 200
-> 3a = 100
-> a = 100/3
-> length= 100/3; width= 200/3(cm)