x = 100, y = 4, z = 1; x > y > z
so, 100 > 16 > 1
x = .5, y = .7, z = .8; z > y > x
so, .5 > .49 > .4
x = 1, y = .7, z = .8; x > z > y
so 1 > .49 > .4
Ans E
Another GMAT PREP>?
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