math
posted by Anonymous .
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?

rate is 120 cards per hour y=120x
y=120(6)
120(6)= 720
he files 720 cards after 6 hours
so 900720= 180
180 cards left to file
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