Multiple choice

The average of 5 numbers is 12. The sum of the last 4 numbers is 47. Find the first number.

  1. 11

  2. 12

  3. 13

  4. 14

  5. 15
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C Correct answer
Explanation

Sum of 5 numbers = 5 * 12 = 60. Sum of last 4 numbers = 47. First number = 60 - 47 = 13.

AI explanation

Using the average sum formula, the total sum of all 5 numbers is 5 x 12 = 60. Since the sum of the last 4 numbers is 47, the first number is 60 - 47 = 13.

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