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If x is the average (arithmetic mean) of m and 9, y is the average of 2m and 15, and z is the average of 3m and 18, what is the average of x, y, and z in terms of m?

 Jan 28, 2020
 #1
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I will assume that 2m  means one number 2m   and NOT m + m   and 3m does not mean three m's

 

x = (m+9)/2        y = (2m+15)/2        z = (3m+18)/2

 

To find their average, add them together and divide by 3

 

[    (m+9)/2   +  (2m+15)/2  + (3m+18)/2  ]   / 3

 

(6m + 42)/2    /  3

3m+21   /  3

m+7

 Jan 28, 2020

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