If X+Y = 2X-2Z, X+2Y = 4Z and X+Y+Z = 21, what is the value of Y/Z?
Choose the correct choice from the following:
A) -4.5.
B) 0.667.
C) 1.7.
D) 3.
E) 2.5.
X+Y = 2X-2Z   Y= X-2Z---------- 1   X+2Y = 4Z   -X+4Z= 2Y--------- 2   Adding equation 1 from equation 2   2Z = 3Y   Y/Z = 0.667   0.667. is the answer
<result>B</result>
If X+Y = 2X-2Z, X+2Y = 4Z and X+Y+Z = 21, what is the value of Y/Z?