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GRE Math Work Rate: Practice Question of the Week #29 Answer

Here are the answer and explanation to yesterday’s practice question. Thanks for sending in all of your answers!

 

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3 Responses to GRE Math Work Rate: Practice Question of the Week #29 Answer

  1. Jared Hensley July 30, 2014 at 12:27 pm #

    I feel like this guy does a good job with the easy and medium level questions, but he seems to be a bit too robotic on more difficult topics, at least for me. Some of the more obvious steps are skipped over and the entire solution is somewhat hurried. I appreciate the content but from time to time I have this issue with Magoosh.

  2. Arnita December 14, 2011 at 2:26 pm #

    Where are the 1’s coming from in this solution?

    In addition, how does 1/A –> (A-1)/A? Is A being used as distance or work?

    • Chris Lele
      Chris December 14, 2011 at 5:13 pm #

      (A – 1)/A = A/A – 1/A = 1 – 1/A. After one minute 1/A has been pumped out. The 1 stands for the total job. So in 1 minute 1 – 1/A of the job remains uncompleted. A in this case stands for work rate.


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