Multiple choice

The average of five numbers is 8 and the average of the last three numbers is 6. The average of the first two numbers is ____.

  1. 7

  2. 11

  3. 2

  4. 22
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B Correct answer
Explanation

Sum of 5 numbers = 5 * 8 = 40. Sum of last 3 numbers = 3 * 6 = 18. Sum of first 2 = 40 - 18 = 22. Average of first 2 = 22 / 2 = 11.

AI explanation

The total sum of all five numbers is 5 multiplied by 8, which is 40. The sum of the last three numbers is 3 multiplied by 6, which is 18. The sum of the first two numbers is the difference between these totals, giving 40 minus 18, which equals 22. The average of the first two numbers is 22 divided by 2, which equals 11.

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