SOLUTION: Mary alone can finish a painting job in 12 days. Gary alone can do the same jon in 20 days. Mary works alone for 4 days and then Gary joins in to help. In how many days will they f

SOLUTION: Mary alone can finish a painting job in 12 days. Gary alone can do the same jon in 20 days. Mary works alone for 4 days and then Gary joins in to help. In how many days will they f

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Question 834217: Mary alone can finish a painting job in 12 days. Gary alone can do the same jon in 20 days. Mary works alone for 4 days and then Gary joins in to help. In how many days will they finish the job
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
4/12 +x/20=1
x/20=2/3
3x/60=40/60
3x=40
x=40/3 =13 1/3

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