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