The average of five numbers is 18. When one number is removed, the average of the remaining four is 16. What number was removed?
Answer and explanation
Correct answer: A. 26
- Step 1: The total of five numbers is 5 x 18 = 90, and the total of four is 4 x 16 = 64.
- Step 2: The removed number is 90 - 64 = 26.
Answer
26.
Why not the others: The other values come from mixing the counts 4 and 5 or from adding the change in average directly to 18.
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