Multiple choice

If the average of five numbers is $10$, and the fifth number is $6$, find the average of the first four numbers.

  1. $9$
  2. $10$
  3. $11$
  4. $12$
  5. $13$
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C Correct answer
Explanation

Sum of 5 numbers = 5 * 10 = 50. Sum of first 4 numbers = 50 - 6 = 44. Average of first 4 numbers = 44 / 4 = 11.

AI explanation

Using the average formula, the total sum of all five numbers is 10 multiplied by 5, which equals 50. The sum of the first four numbers is the total sum minus the fifth number: 50 minus 6 equals 44. The average of the first four numbers is 44 divided by 4, resulting in 11.

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