The mean of a set of numbers is 20. If one number is increased by 360, the mean increased to 40. How many numbers are in the set?

use no algebra.

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- Oct 14th 2008, 07:26 AM #1

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- Oct 14th 2008, 10:04 AM #2

- Oct 14th 2008, 07:06 PM #3

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- Oct 14th 2008, 07:13 PM #4

- Oct 14th 2008, 07:43 PM #5

- Oct 14th 2008, 09:11 PM #6