Neither stmt is sufficient by itself, since none ties all four variables. But put both stmts together to get that you're subtracting a smaller value (z) from a greater value (y) as compared to subtracting a greater value (x) from a smaller value (w).
You could also look at it this way:
z < x --- multiply each side by -1 to get:
-z > -x
y > w
----------- add them all up
y - z > w - x.
Inequalities (IV)
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Source: Beat The GMAT — Data Sufficiency |
