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is z < 4?

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Source: — Data Sufficiency |
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by Mavin » Fri Aug 14, 2009 8:48 pm
Since it is not mentioned that z & T are integers.

From Stmt 1: Z can take any value less than 9 & hence not sufficient.
From Stmt 2: Substitute t = -5; you will get Z>3/5 which can be less than or greater than 4 & hence not sufficient.

Combining: -3/5<Z<9 not sufficient.

Hence E.
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by tohellandback » Fri Aug 14, 2009 9:30 pm
zt < -3,
one of z and t is +ve and other is negative.
is z < 4?

a. z < 9
z can be positive or negative.
NOT SUFF

b. t < -4
z must be +ve but could be >4 or <4

combined,
Z must be positive and <9
but again it can be > or < 4

answer E
The powers of two are bloody impolite!!
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