A box with a rectangular base is to be constructed of material costing $2/inch^2 for the sides and the bottom, and $3/inch^2 for the top. If the volum is 1215 inches^3 and the length is twice the width, which dimensions minimize cost. I understand that I have "l=2w" and "l*w*h=1215" so "3w*h=1215" but I don't know how to eliminate h or w.

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