The average (arithmetic mean) of 5 numbers is 18. If a new number is added to the set, the new average of the 6 numbers becomes 20. What is the value of the new number?

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C) 30. The sum of the initial 5 numbers is 5 * 18 = 90. After adding a new number, the sum of 6 numbers is 6 * 20 = 120. The value of the new number is the difference: 120 - 90 = 30.

The average (arithmetic mean) of 5 numbers is 18. If a new number is added to the set, the new average of the 6 numbers becomes 20. What is the value of the new number?

✓ Correct Answer: Option C

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