The average of five quantities is 10 and the average of three of them is 9. What is the average of the
remaining two items?
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Answer:
11.5
Explanation:
The average of 5 quantities is 10.
Therefore, the sum of all 5 quantities is 50.
The average of 3 of them is 9.
Therefore, the sum of the 3 quantities is 27.
Therefore, the sum of the remaining two quantities = 50 - 27 = 23.
Hence, the average of the 2 quantities = 23/2 = 11.5.
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