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Ernie can paint a house in just 2 hours. Izzy can paint a house in 5 hours (because she takes breaks to read and sip lemonade  ). Working together, how long will it take them to paint 2 houses?

 Aug 25, 2021
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Ernie paints 1/2 a house per hour

 

Lizzie paints 1/5 of a house per hour

 

Together they paint  1/5  +  1/2   =  7/10 of a house in an hour

 

So that is 10/7   hours per house, and that's 20/7 hours for two houses

 Aug 25, 2021

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