SOLUTION: ABC can finish the job in 2 days altogether. A can finish it alone in 5 days. B can finish it alone in 4 days. How many days can C finish the job alone?

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Question 859767: ABC can finish the job in 2 days altogether. A can finish it alone in 5 days. B can finish it alone in 4 days. How many days can C finish the job alone?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x represent How many days can C finish the job alone 

 1%2F5+%2B+1%2F4+%2B+1%2Fx+=+1%2F2     |Multiplying thru by 20x so as all denominators = 1

   4x + 5x + 20 = 10x

             20 = x, How many days can C finish the job alone