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by parallel_chase » Tue Sep 09, 2008 3:48 pm
x+2y+3z = 1.5(x+y+z)

x+2y+3z = 1.5x+1.5y+1.5z

.5y + 1.5z = .5x

y+3z = x

Hence A is the answer.
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by mim3 » Thu Sep 11, 2008 12:08 pm
Alternative method:

I found values for x,y and z that when combined came out to an average of 1.5. If:

1% x=1
2% y=1
3% z=0

then (x+y)/2= 1.5

So, pluggint the values into the answer choices knowing that x=1, which equation also equals 1?

A) y+3z= x
1+ 3(0)= 1

That works. A is the answer.
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