Posted by Melanie on Tuesday, December 6, 2011 at 10:16pm.
L = 5W-13
LW = 28
(5W-13)W = 28
5W^2 - 13W - 28 = 0
(5W+7)(W-4) = 0
so, W=4
L = 5*4-13 = 7
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