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7 x > 8 x

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by sanju09 » Thu Jul 29, 2010 5:13 am
Is x < 0?

1. 7 x > 8 x.
2. -3 (x) > 0.

[spoiler]Source: majortests.com[/spoiler]
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Source: — Data Sufficiency |
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by selango » Thu Jul 29, 2010 5:23 am
x<0?

stmt1,

7x>8x

x=-1,-7>-8

When x is -ve only 7x>8x

Suff

stmt2,

-3(x)>0

If x is -ve only,-3(x)>0

Suff

Pick D
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by aleph777 » Thu Jul 29, 2010 6:39 am
ANSWER: D

1. 7x > 8x can only be true if x = a negative number.
7(-2) > 8(-2) : TRUE
7(2) > 8(2) : FALSE

Therefore, 1 is SUF.

2. -3x > 0 can only be true if x = negative since neg * neg = positive, but neg * pos = negative.

Therefore, 2 is SUF as well.
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