If k > 0, x + 2k = y, and y + 3k = z, what is the ratio between z - x and y - x ?  Options.
A) 3 to 1	B) 3 to 2	C) 4 to 1	D) 5 to 1	E) 5 to 2
y-x = 2k   z-y = 3k   Let's add the two equations together:   z-x = 5k   The ratio of z-x to y-x is 5:2.   The answer is 5 to 2.
<result>E</result>
If k > 0, x + 2k = y, and y + 3k = z, what is the ratio between z - x and y - x ?