Good Morning! Here’s one to wake you up and get your brain in gear.

x+y=10 y+z=15 x+z=17

What is the average (arithmetic mean) of x, y, and z?

A. 7

B. 14

C. 15

D. 21

E. It cannot be determined from the information given.

Now * you* work it. It’s super great to know an easy, quick way to work this so you can save time the day you take the test. You will need if for the reeeeaaaallllly hard ones! Know what I mean?

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Solution: A. 7

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