Acontractor digs a hole for the basement of a new house that is 40ft long and 10 half feet deep what is the width of the hole if 6510 cubic feet of dirt are removed

V=LWD   (I am assuming that you meant depth is 10 1/2 or 10.5 deep)

W=V/(LD)

W=6510/(40*10.5)

W=6510/420

W=15.5 ft

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