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16 October, 06:01

It costs $900 to run a water treatment facility machine for 4 hours. Jake spent $4500 to run the machine. For how many hours did jake run the machine?

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  1. 16 October, 08:14
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    900 / 4 = 225 per hour.

    Divide total cost by cost per hour:

    4500 / 225 = 20 hours
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