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# the maximum load a horizontal beam can safely hold varies with the width and the square of the depth and inversly with the length of a 10 foot beam

the maximum load a horizontal beam can safely hold varies with the width and the square of the depth and inversly with the length of a 10 foot beam with width 4 and depth 4 will safely hold up to 800 pounds. how many pounds will a 12 foot beam with width 3 and depth 4 hold?