Multiple choice

The average of 7 results is 16, the average of the first three is 14 and that of the last three is 18. What is the fourth result?

  1. 16

  2. 48
    • 16
    • 8.4

  5. 6.8
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A Correct answer
Explanation

If the average of 7 numbers is 16, then the sum of numbers must be,  112. If average of first 3 numbers is 14, then the sum of numbers must be 42. And if the average of the next 3 numbers is 18, the sum of numbers must be 54. Now, 112 - 42 - 54 = 16. Hence, the last number is 16.

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