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Sub 505 Level|   Algebra|      
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ice t
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If pq ≠ 0, is x an integer? Updated on: 23 Feb 2015, 12:58
Originally posted by ice t on 29 Aug 2004, 15:03.
Last edited by Bunuel on 23 Feb 2015, 12:58, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
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E
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5% (low)

Question Stats:

83% (01:04) correct 17% (00:57) wrong based on 426 sessions

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If pq ≠ 0, is x an integer?

(1) x = 3p – 2q
(2) p = q
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E
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SigEpUCI
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If pq ≠ 0, is x an integer? 29 Aug 2004, 20:14
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I'd go E almost instantly.

If p = q = .1, x is not integer
If p = q = 1, x is integer
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ywilfred
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If pq ≠ 0, is x an integer? 29 Aug 2004, 22:26
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1) x=3p-2q

2) p=q

(1) not sufficient. P and Q could be fractions, and the operation of x could result in some fraction as well.
(2) not sufficient. Same reason as above.

(1) and (2) put together doesn't tell us anything more than we already know.

So (E).
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If pq ≠ 0, is x an integer? 30 Aug 2004, 05:42
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I would choose E too.

p and q could be fractions like p = 1/2 and q = 5/7 or they both could be integers.

Regards,

Alex
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ice t
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If pq ≠ 0, is x an integer? 30 Aug 2004, 06:37
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actually this is from one of the paper tests and it gives the answer as A which makes no sense to me.

???
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If pq ≠ 0, is x an integer? 30 Aug 2004, 09:17
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nope, E. Definately. The best we can get to is combining them together and seeing that x = p = q. But since we don't know what they are, just that their not zero, it's got to be E.
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If pq ≠ 0, is x an integer? 23 Feb 2015, 12:51
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Hi All,

This question is ultimately about integers vs. non-integers and is perfect for TESTing VALUES.

We're told that PQ is not equal to 0, which means that neither P nor Q can be 0. We're asked if X is an integer. This is a YES/NO question.

Fact 1: X = 3P - 2Q

IF....
P=1
Q=1
X = 3-2 = 1
The answer to the question is YES.

IF....
P=1/2
Q=1/2
X = 3/2 - 2/2 = 1/2
The answer to the question is NO.
Fact 1 is INSUFFICIENT

Fact 2: P=Q

Both TESTs from above also fit this Fact.
Fact 2 is INSUFFICIENT.

Combined, we have the same two TESTs that fit both Facts.
We have a YES and a NO answer.
Combined, INSUFFICIENT

Final Answer:
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E

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If pq ≠ 0, is x an integer? 23 Feb 2015, 13:06
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ice t
If pq ≠ 0, is x an integer?

(1) x = 3p – 2q
(2) p = q

The answer is straight E, without any algebra or number plugging.

If pq ≠ 0, is x an integer?

(1) x = 3p – 2q. So, we have that x is equal to some number (3p - 2q). We know nothing about p and q (other than neither of them is 0), hence we cannot determine whether it's an integer. Not sufficient.

(2) p = q. Clearly insufficient.

(1)+(2) x = 3p – 2q = 3p - 2p = p. And again we have that x is equal to some number p, which we know nothing about. Not sufficient.

Answer: E.
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If pq ≠ 0, is x an integer? 16 Sep 2016, 16:57
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Correct answer is E. Here's why:

(1) x = 3p – 2q

We have no indication of the values that p and q can take on; for all we know, both could be decimals or fractions - either way, this statement is INSUFFICIENT

(2) p = q

We have the same issue as in (1). INSUFFICIENT
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If pq ≠ 0, is x an integer? 15 Mar 2022, 12:14
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