If X+Y = 2X+Z, X-2Y = 4Z and X+Y+Z = 21, what is the value of Y/Z? Choose the correct choice from the following answers
A) -4.5.	B) -2.	C) -1.7.	D) 3.	E) 6.
X+Y = 2X+2Z   Y= X+2Z---------- 1   X-2Y = 4Z   X-4Z= 2Y--------- 2   Subtracting equation 1 from equation 2   -6Z= Y   Y/Z= -6   6. is the answer
<result>E</result>
If X+Y = 2X+Z, X-2Y = 4Z and X+Y+Z = 21, what is the value of Y/Z?