jeffboshine wrote:If zt < -3, is Z<4?

I) Z<9
II) t<-4


I came up with B as answer. That was wrong. The answer is E.

If T<-4, Then Z > 1/2 (if Z = -6) and Z > 1/10 (if Z = -30). Wouldn't that make II sufficient?

If zt < -3, is z < 4?

(1) z < 9
If z = 5, t = -5, then zt = -25, which is < -3. Here z > 4.
If z = 3, t = -5, then zt = -15, which is < -3. Here z < 4.
No definite answer; NOT sufficient.

(2) t < -4, taking the same examples in statement 1.
If z = 5, t = -5, then zt = -25, which is < -3. Here z > 4.
If z = 3, t = -5, then zt = -15, which is < -3. Here z < 4.
No definite answer; NOT sufficient.

Combining (1) and (2), again we take the same examples, so there is no additional info; NOT sufficient.

The correct answer is E.