Math Test Question on Averages

Hello everyone, today I will be covering a standardized math test type question. You will be tested on your ability to manipulate equations to what you need in order to find the solution of the problem. The topic for this video will be average. What is the average of abc or xyz?

Problem of the video: Give a + b = 12; b + c = 17; a + c = 19; what is the average of a, b, and c?

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