Multiple choice

The average of 9 quantities is 21 and the average of 6 of them is 22. What is the average of the remaining 3 quantities?

  1. 17

  2. 18

  3. 20

  4. 19

  5. 21
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D Correct answer
Explanation

Let the average of the remaining 3 quantities be x.

Then, as per the question,

Average of 9 quantities is 21.

So, 21 = (6 * 22 + 3 * x)/9

189 = 132 + 3x

x = 57/3

x = 19

So, required average = 19

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