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Tina baked 280 cookies. She gave 70 cookies to Celine and some cookies to Ben. She had 3/7 of the total cookies left.

(a) How many cookies did she have left?
(b) What fraction of the total cookies did she give to Ben?

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1 answer
  1. number of cookies given to Ben --- x

    cokkies left = 280 - 70 - x

    210 - x = (3/7)(280)
    -x = -90
    x = 90

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