A category of question that appears regularly on the GMAT is that of work problems. A typical question involves one machine working at a particular rate, and another machine working at a different rate. The question may ask you to work out how long a job will take if both machines work on it together. Here’s a popular strategy that you can use (stay tuned for our tutors’ favorite strategy next week):

Source: The quick way through GMAT work problems | Economist GMAT Tutor

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