Sample Question #130 (mathematics – arithmetic)
The simple mean of x and y is 20. If z = 5, what is the average of x, y and z?
[Source: sample GRE question on the ets.org website]
This is easy — as long as you’re not experiencing a nervous breakdown at the interview, you should be able to solve this quickly.
The sum of x and y is 40, so the sum of all three variables is 45. Therefore, the new average is 15.
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