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Averages - April 13, 2004

The GMAT Sample Math question for the day is from the topic Averages.

Question
The average of 5 quantities is 6. The average of 3 of them is 8. What is the average of the remaining two numbers?

A. 4
B. 5
C. 3
D. 3.5
E. 0.5

The correct choice is (C) and the correct answer is 3

Explanatory Answer
The average of 5 quantities is 6.
Therefore, the sum of the 5 quantities is 5 * 6 = 30.

The average of three of these 5 quantities is 8.
Therefore, the sum of these three quantities = 3 * 8 = 24

The sum of the remaining two quantities = 30 – 24 = 6.
Average of these two quantities = = 3.
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