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gmat bible inequality Qs

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by vkb16 » Wed Mar 18, 2009 4:17 am
If its true that z<8 and 2z>-4, which of the following must be true?

a. -8<z<4
b. z>2
c. z>-8
d. z<4
e. none of the above

oa is c

but i think its E

the qs says MUST be true, and the OA maybe/may not be true....
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Source: — Problem Solving |

by cramya » Wed Mar 18, 2009 5:01 am
2z>-4
z>-2

-2<z<8


We can confidently say z>-8 -> must be true since

z>2 and z<4 could be true
-8<z<4 -> no
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