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David and Peter had $90 and $200 respectively. They were each given an equal amount of money. Then Peter had twice as much money as David. How much money did each boy receive?

  • math -

    I think it should be calculated like this:
    Let x be the amount of money each boy received
    2*(90+x)=200+x or 90+x=(200+x)/2
    Therefore, each boy received $20

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