Question 828950
A perimeter is a fence around something.  To fence a rectangle, you need 2 pieces of the length and 2 pieces of the width.
2L + 2W = P
The question gives you the following:
P = 66
L = 2W
Plug in the numbers:
2(2W) + 2W = 66
Multiply:
4W + 2W = 66
Add the Ws:
6W = 66
Divide by 6
W = 11
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Now that you have the width, you can find the length.  "the length is twice the width"  L = 2*11, or 22.
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Let's prove this correct.
2L + 2W = 66
2(22) + 2(11) = 66
44 + 22 does indeed equal 66.