Multiple choice

The average of two numbers is 15. If one number is 10, what is the other number?

  1. 20

  2. 12

  3. 15

  4. 8

  5. 21
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A Correct answer
Explanation

Average = (x + 10) / 2 = 15. x + 10 = 30. x = 20.

AI explanation

The average of two numbers equals their sum divided by 2, meaning their sum is the average multiplied by 2. The sum of the two numbers is 15 times 2, which equals 30. Since one number is 10, the other number is 30 minus 10, which equals 20.

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