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Tom has a 500 gallon pool. He is able to drain it at a rate of 15 gallons per minute.  if the pool still has 170 gallons of water remaining, how many minutes was the pool draining?

 Mar 6, 2021
 #1
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(  500 -170 gal) / 15 gal/min = ............ mins

 Mar 6, 2021
 #2
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500-170 is equal to 330, so 330 gallons escaped. 330/15 is equal to 22, so 22 minutes had passed since the plug was pulled. 

 Mar 6, 2021

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