A 40lb child sits at one end of a teeter-totter-totter which is 12 feet long and has the fulcrum in the center. How many feet from the fulcrum should a 60 lb child sit so the teeter-totter will balance?

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  1. 60/40 = 3/2, so the 60lb child should sit 2/3 as far from the fulcrum.

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