Multiple choice

If n is the average of the three numbers 6, 9 and k, what is the value of k in terms of n?

  1. 3n - 15

  2. n - 5

  3. n - 15

  4. (n - 15)/3

  5. (n + 15)/3
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A Correct answer
Explanation

Average = (6 + 9 + k) / 3 = n. So 15 + k = 3n, which means k = 3n - 15.

AI explanation

Using the average formula, we write the equation n equals the sum of 6, 9, and k divided by 3. This simplifies to 3n equals 15 plus k. Solving for k, we subtract 15 from 3n to get k equals 3n minus 15.

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