What is the maximum weight of the paddlers and other gear

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A simple "box-like" canoe has outer dimensions of 15.0 ft in length, 2.0 ft in width, and 1.0 ft in depth. The canoe shell is made of concrete with a specific weight of 58.0 lbs/ft^3 and contains 15.0 lbs of steel reinforcement with negligible volume. The volume of concrete in the canoe shell can be estimated by the following equation: V=tx64 ft^2, where t is the hull thickness in feet.

a four inch freeboard is desired. for a hull thickness of .5 in what is the maximum weight of the paddlers and other gear?

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