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Addison, Amanda, and Ashley can paint a room together in 6 hours. If Addison and Amanda could do it in 10 hours, how many hours would it take Ashley by herself?​

 Feb 27, 2020
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1/Ashley   + 1/amanda  + 1/ addison =  1/6

1/addison  + 1/amanda = 1/10

 

1/10 + 1/ashley = 1/6

1/ashley    = 2/30

ashley = 30/2 = 15 hours   

 Feb 27, 2020

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