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# GMAT Question of the Day - Problem Solving - Overlapping Sets/Picking Numbers

At a certain rail-yard each train is either a freight train or a commuter train and either runs on the southern line or the northern line. 20% of the commuter trains run on the southern line and the number of freight trains that run on the southern line represents 20% of the total trains at the rail yard. If the commuter trains represent 44% of the total trains at the rail yard, approximately what percent of the trains run on the northern line?

A. 41%

B. 46%

C. 57%

D. 63%

E. 71%

## GMAT Question of the Day Solution

These GMAT overlapping sets questions are straightforward but take some organizing so it's important to take your time with the set-up. On the whole, the GMAT is an organizational challenge. Try picking a value for the total. That should make things easier. Whenever you are dealing with a question that has variables or percents/proportions in the answer choices consider picking numbers to make the question more concrete. Also, did you define what you were looking for: Northern/Total? Defining the question will help you plan your work and will draw you towards the solution.

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