Multiple Choice:

A. 15

B. 25

C. 27

D. 40

If the mean of the other five numbers is x, then their sum is 5x. The sum of all six numbers is 5x + 15 or 25*6 = 150. We obtain an equation: 5x + 15 = 150, whose solution is x = (150 - 15)/5 = 135/5 = 27.

Answer: C

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