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21 May, 18:20

David assembles 12 circuit boards in 255 minutes. Amy assembles 9 circuit boards in 170 minutes. Who works at a faster rate?

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  1. 21 May, 22:04
    0
    It would be Amy, because Amy does about 18.8 boards per min and David does about 18.75 boards per min.
  2. 21 May, 22:11
    0
    I think Amy works at a faster rate.
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