If x=2y=z, what is x-y, in terms of z?  Answers.
A) z B) z/2 C) z/3 D) 2z/5 E) z/5
x=2y=z   x = z   and y = z/2   x-y = z - z/2 = z/2   Answer is z/2
<result>B</result>
If x=2y=z, what is x-y, in terms of z?