A set of 5 numbers has an average of 12. If three of the numbers are 8, 10, and 15, and the other two numbers are equal, what is the value of one of the other two numbers?

✓ Correct Answer: Option C

The sum of the 5 numbers is 5 * 12 = 60. The sum of the three given numbers is 8 + 10 + 15 = 33. The sum of the remaining two equal numbers is 60 - 33 = 27. Since they are equal, each is 27 / 2 = 13.5.