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x < y?

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Source: — Data Sufficiency |
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by Bill@VeritasPrep » Tue Aug 07, 2012 8:12 pm
To answer, we'll need to know something about the relationship between x and y.

1) z < y

This tells us nothing about x, so we can safely say it's insufficient.

2) z < x

This tells us nothing about y, so it is similarly insufficient.

When we put them together, we know that both x and y are greater than z, but we don't know anything about how x and y relate to each other. Either one could be greater than the other, or they could be equal. Insufficient.
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