Posted by **Thomas** on Wednesday, March 23, 2011 at 1:58pm.

A fence is to be built to enclose a rectangular area of 200 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 13 dollars per foot.

Find the length L and the width W (with W less than or equal to L) of the enclosure that is most economical to construct.

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