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joemama142000
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is wxy = -1? 1)x, y and w are all negative 2)w + y + x= -3 24 Oct 2005, 13:33
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is wxy = -1?

1)x, y and w are all negative

2)w + y + x= -3

My question is what negative numbers add up to -3 and when multiplied equals -1 ?

thanks



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BumblebeeMan
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is wxy = -1? 1)x, y and w are all negative 2)w + y + x= -3 24 Oct 2005, 13:38
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Quote:
is wxy = -1?

1)x, y and w are all negative

2)w + y + x= -3
Show more


The answer is E.

1 is insufficient. x, y, and z could be any negative numbers.

2 is insufficient, one of the numbers could be positive and two could be negative, making wxy a positive number.

1 and 2 together are insufficient. The problem does not state that w, x, and y are all integers.

For example, suppose that w=-1, x=-3/2, and y=-1/2.
w+x+y = -3
wxy = -3/4
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is wxy = -1? 1)x, y and w are all negative 2)w + y + x= -3 24 Oct 2005, 13:54
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joemama142000
is wxy = -1?

1)x, y and w are all negative

2)w + y + x= -3

My question is what negative numbers add up to -3 and when multiplied equals -1 ?

thanks
Show more



good question.. and that is exactly the solution. the only condition which satisfies this is when w=y=x=-1
so (-1)+(-1)+(-1) = -1 and (-1)(-1)(-1) = -1

Hence, C if all are assumed to be integers... if not then E...
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is wxy = -1? 1)x, y and w are all negative 2)w + y + x= -3 24 Oct 2005, 13:57
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Hence, C if all are assumed to be integers... if not then E...
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And as we all learn the hard way -- at least every once in a while -- you can't ever assume that numbers on the GMAT are integers.
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is wxy = -1? 1)x, y and w are all negative 2)w + y + x= -3 24 Oct 2005, 14:01
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joemama142000
is wxy = -1?


My question is what negative numbers add up to -3 and when multiplied equals -1 ?

thanks
Show more


as explained in above posts, this is only possible when:
x=y=z = -1



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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Thank you for understanding, and happy exploring!