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Is yz = x? (1) y > x/z (2) z < 0

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Is yz = x? (1) y > x/z (2) z < 0  [#permalink]

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New post 10 Apr 2015, 05:15
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

63% (01:14) correct 37% (01:20) wrong based on 206 sessions

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Re: Is yz = x? (1) y > x/z (2) z < 0  [#permalink]

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New post 10 Apr 2015, 05:20
1
X = y/z can be rearranged as
y = x/z. So we need to find y.

A clearly tells us that y is more than x/z. So its sufficient.

Second one doesn't give enough information to deduce the relation of the equation.

Answer is A

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Is yz = x? (1) y > x/z (2) z < 0  [#permalink]

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New post 10 Apr 2015, 07:13
1
1
Bunuel wrote:
Is yz = x?

(1) y > x/z
(2) z < 0


Kudos for a correct solution.


1) we can't make inference about is yz > x or yz < x because we don't know which sign has z. But we can say that yz doesn't equal to x and this is Sufficient
2) Insufficient

Answer is A
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Re: Is yz = x? (1) y > x/z (2) z < 0  [#permalink]

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New post 10 Apr 2015, 23:33
1
1) y >x/z
this gives yz>x , when z +ve , or yz<x , when z -ve. Thus yz is not equal, no matter what z is. SUFF
2) z<0 . now in yz = x, with z <0 but no other info about y or x, we cannot say whether yz = x, yz<x or yz>x. clearly NS.

Ans A.
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Re: Is yz = x? (1) y > x/z (2) z < 0  [#permalink]

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New post 13 Apr 2015, 04:05
Bunuel wrote:
Is yz = x?

(1) y > x/z
(2) z < 0


Kudos for a correct solution.


VERITAS PREP OFFICIAL SOLUTION:

You actually don’t need to know the sign. When you use statement 1 alone and multiply both sides by z, you either get yz > x (if z is positive) or yz < x (if z is negative). It’s either greater than or less than with no room for equals, so you don’t need the sign. So statement 2 isn’t always necessary, but if it appears to give assistance you’ve got to look – you have to at least consider whether it’s important, because that’s where the GMAT has set up the difficulty. On the most difficult problems, the GMAT will tend to reward those who can leverage all available information to think critically and make a good decision, so it pays to at least take a fairly-obvious-on-its-own statement and look at it in the context of the other statement, just in case.

Answer: A.
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Re: Is yz = x? (1) y > x/z (2) z < 0  [#permalink]

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New post 28 Jan 2016, 08:06
[quote="Bunuel"]Is yz = x?

(1) y > x/z
(2) z < 0


The question asks if yz=x => y=x/z .
(1) first statement tells us that y is strictly greater than x/z, that means y not equals x/z. Answer is no . Sufficient.
(2) statement 2 says z is negative, since we do not have any other information, the answer might be yes or no. Insufficient.
Hence, Answer is A.
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Re: Is yz = x? (1) y > x/z (2) z < 0  [#permalink]

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New post 21 Aug 2018, 04:08
Solved that in 5 seconds. It was very easy.

For yz to be equal to x, y has to be equal to x/z which statement 1 negates.

Statement 2 does not have enough information.

The answer is A.
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Re: Is yz = x? (1) y > x/z (2) z < 0   [#permalink] 21 Aug 2018, 04:08
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