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Number Line Problem

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Source: — Data Sufficiency |
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by shovan85 » Sat Oct 02, 2010 11:42 pm
IMO C

Right to zero in number line means if z and f both are +ve.

1. z*f > 0 then either z and f > 0 or both z and f < 0. So Not Sufficient.

2. z+f > 0 then either z,f > 0 or z>0,f< 0 (say z=3,f=-2). So not sufficient.

Now combine both. if z<0 and f<0 then z+f < 0 but z+f>0 and zf>0. So Sufficient
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by ashokkadam » Sat Oct 02, 2010 11:43 pm
Statement 1: z and f are both +ve or both -ve. So z and f could be either to the right or to the left of 0. INSUFFICIENT>.
Statement 2: z and f can be anything except both -ve. INSUFFICIENT.

Together, we can say that z and f are both +ve, hence SUFFICIENT.

C is the answer.
vongdn wrote:Are the integers z and f to the right of of 0 on the number line?

(1) the product of z and f is positive.
(2) the sum of z and f is positive.
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