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Review: Rectangular Floor
Explanation
Let's call the length and width of this floor L and W. The length is half, so we have 
.
We can confirm that W is larger in
that equation, so the 2 is on the correct side. The perimeter is 240, so we
also have 
.
We can solve by substituting; since ,
then the equation for perimeter becomes 
.
Therefore, 
and 
.
We have found the width! The question is asking for the length, which is half
the width, so it is 40.
The correct answer is (B).
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