1. Uncle fred is babysitting three of his nieces and nephews. At the playground,

Question

1. Uncle fred is babysitting three of his nieces and nephews. At the playground, Uncle Fred, who weighs about 200 pounds, sits on one side of the see-saw 3 feet away from the pivot. One of the kids, who weighs about 100 pounds, sits on the other side 2 feet away from the pivot. His sister, who doesn't like him, sits at the very end, 6 feet away from the pivot on the side opposite Uncle Fred. She weights in at 75 pounds. Where must the third child, who weighs 50 pounds, sit in order to balance the see-saw?

Explanation / Answer

taking moments about pivot

200 * 3 + 75 * 6 = 100 * 2 + 50 * x

solving x = 17 m from pivot opposit side of uncle

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