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

By on December 13, 2011 in Math Concepts, Math Multiple Choice, Math Question Types, Practice Question of the Week, Video Tips and Explanations, Work Rate

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

 

About the Author

Margarette Jung graduated from UC Berkeley as a double major in English Literature and Linguistics. She has been teaching for large companies and tutoring privately for more than 5 years.

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

  1. 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?

    Reply
    • 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.

      Reply


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