SOLUTION: the mean of 3 numbers is a. given that the 1st and 2nd numbers stay the same and the 3rd number is decreased by 9, what is the new mean in terms of a?

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Question 1154794: the mean of 3 numbers is a. given that the 1st and 2nd numbers stay the same and the 3rd number is decreased by 9, what is the new mean in terms of a?
Answer by ikleyn(52914) About Me  (Show Source):
You can put this solution on YOUR website!
.

Let the numbers be "x", "y" and "z".


We are given that  %28x%2By%2Bz%29%2F3 = a.


Hence,  x + y + z = 3a.


The new mean is   %28x+%2B+y+%2B+%28z-9%29%29%2F3 = %28x+%2B+y+%2B+z+-+9%29%2F3 = %28x+%2B+y+%2B+z%29%2F3+-+3 = a - 3.    ANSWER

Solved.

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