The average (arithmetic mean) of 5 numbers is 25. If three of these numbers are 18, 25, and 30, and the remaining two numbers are equal, what is the value of one of the equal numbers?

Question

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C) 26. The sum of the 5 numbers is 5 * 25 = 125. The sum of the three given numbers is 18 + 25 + 30 = 73. Let the two equal numbers be x. So, 73 + 2x = 125. 2x = 52, so x = 26.

The average (arithmetic mean) of 5 numbers is 25. If three of these numbers are 18, 25, and 30, and the remaining two numbers are equal, what is the value of one of the equal numbers?

✓ Correct Answer: Option C

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