SOLUTION: A roofer requires 12 h to shingles a roof. After the roofer and an apprentice work on a roof for 9 h, the roofer moves on to another job. The apprentice requires 12 more hours to f

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Question 1176267: A roofer requires 12 h to shingles a roof. After the roofer and an apprentice work on a roof for 9 h, the roofer moves on to another job. The apprentice requires 12 more hours to finish the job. How long would it take the apprentice. Working alone, to do the job?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
x, the time if apprentice does 1 job alone


9%281%2F12%29%2B9%281%2Fx%29%2B12%281%2Fx%29=1------------simplify, and solve this for x.