Multiple choice

The average 7 numbers is 23. If one of the numbers is removed , the average of the remaining numbers is 17. Find the number that was removed.

  1. 52

  2. 55

  3. 59

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Initial sum = 7 * 23 = 161. New sum = 6 * 17 = 102. The removed number is 161 - 102 = 59.

AI explanation

By the formula for the removed number, the value equals the difference between the total sum of the original set and the new set. The original sum is 7 times 23, which is 161, and the new sum is 6 times 17, which is 102. Subtracting 102 from 161 gives the removed number as 59. The removed number is 59.

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