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Math Help - arithmetic problem

  1. #1
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    arithmetic problem

    An experienced plumber made 600 dollars for working on a certain job .his apprentice , who makes 3 dollars per hour less, also made 600 dollars . however ,the apprentice worked 10 hours more than the plumber. how much does the plumber make per hour
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  2. #2
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    arithmetic problem

    posted by sri340

    let x=plumber rate time on job 600/x
    apprentice time on job= 600/x+10
    apprentice rate =x-3
    multiply his rate by his time=600
    solve the quadratic equation

    bjh
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  3. #3
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    You can use algebra, or you can try numbers.

    Both times worked divide nicely into 600. So the hours could be 20 and 30, 30 and 40, 40 and 50 or perhaps 50 and 60. If the hours were 20 and 30, then the 2 rates would be $30 and $20 - a difference of $10 which is too much. If the hours were 50 and 60, the rates would be $12 and $10 - too close. Try the other pairs.
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