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The load that can be safely supported by a horizontal rectangular beam varies jointly with the width of the beam and inversely with the length of the...

The load that can be safely supported by a horizontal rectangular beam varies jointly with the width of the beam and inversely with the length of the beam. A 15 foot long beam will safely support 600 pounds when the beam when the beam is 5 inches wide and 3 inches thick . What width is required to safely support 800 pounds of weight with a beam that is 8 feet and 4 inches thick?

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