If k > 0, x + 2k = y, and y + 4k = z, what is the ratio between z - x and y - x ?
Choose the correct choice from the following answers:
A) 1 to 4
B) 1 to 2
C) 2 to 1
D) 3 to 1
E) 4 to 1
y-x = 2k   z-y = 4k   Let's add the two equations together:   z-x = 6k   The ratio of z-x to y-x is 6:2 = 3:1.   The answer is 3 to 1.
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If k > 0, x + 2k = y, and y + 4k = z, what is the ratio between z - x and y - x ?