SOLUTION: Person A can paint a house 3 times as fast as person B. Working together they can paint the house in 7 days. How long does it take them each to paint the house?

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Question 733975: Person A can paint a house 3 times as fast as person B. Working together they can paint the house in 7 days. How long does it take them each to paint the house?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
7/3a+7/a=1
7/3a+21/3a=1
28/3a=1
28=3a
a=28/3 days
b= 28 days