Who's afraid of a little GMAT Data Sufficiency and Averages? Not you! Take this one step-by-step to get to the correct answer. Consider timing yourself to see how close you are to the 2 minute suggested average for GMAT DS questions.
Post your answer here in the comments, or on Facebook. We'll provide a full explanation of this problem in a couple days. Happy practicing!
Edit: The explanation has been added.
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