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Mathematics 13 Online
OpenStudy (anonymous):

Use the Law of Levers to solve the problem, x1y1 = x2y2. Milly's older brother weighs 90 pounds and sits 2.5 feet away from the fulcrum of a seesaw. Milly sits 4 feet away and the seesaw balances. About how many pounds does Milly weigh?

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