Question 887395: 1f x+y =6,y+z =7 and x+z=9, what is the average of x,y and z?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Add the equations to get
x+y =6
y+z =7
x+z =9
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2x+2y+2z=22
Factor out 2
2x+2y+2z=22
2(x+y+z)=22
then divide both sides by 2
2(x+y+z)=22
2(x+y+z)/2=22/2
x+y+z = 11
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Now we divide the sum of x,y,z by 3 to average x,y,z
(x+y+z)/3 = 11/3
So the mean or average of x,y,z is 11/3
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