If the average (arithmetic mean) of six different numbers is 25, how many of the numbers are greater than 25?

If the average (arithmetic mean) of six different numbers is 25, how many of the numbers are greater than 25?

(1) None of the six numbers is greater than 50.

(2) Three of the six numbers are 7, 8, and 9, respectively.

Answer: C

Source: Manhattan GMAT

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