The weight needed to balance a lever varies inversely with the distance from the fulcrum to the weight. Where should John, who weights 150 lbs, sit from Wilma, a girl weighing 120 lbs and six feet away from the fulcrum?
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The 60 pound load rests 2 feet from the fulcrum, producing a counter-clockwise torque of 120 foot - pounds around the pivot point.