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A clerk can file cards at the rate of 120 cards per hour. He has a total of 900 cards to file. How many cards remain to be filed after 6 hours?

  • math - ,

    rate is 120 cards per hour y=120x
    120(6)= 720
    he files 720 cards after 6 hours
    so 900-720= 180
    180 cards left to file

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