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]

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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]

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ANSWER

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.