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This is what I have: Is the integer z divisible by 6? 1) The

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Lstadt
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This is what I have: Is the integer z divisible by 6? 1) The [#permalink] New post   31 Jul 2011, 14:31
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

14% (00:00) correct 86% (00:43) wrong based on 10 sessions
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This is what I have:

Is the integer z divisible by 6?

1) The greatest common factor of z and 12 is 3.
2) The greatest common factor of z and 15 is 15.

The book said the answer was
Show Spoiler
A
but what I got was
Show Spoiler
E
. I am very confused.

Another question.

Is N divisible by 7?

1) N = x - y, where x and y are integers.
2) x is divisible by 7, and y is not divisible by 7.

Again, the book says the answer is
Show Spoiler
C
but what I got was
Show Spoiler
E
.



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Re: This is what I have: Is the integer z divisible by 6? 1) The [#permalink] New post   31 Jul 2011, 16:05
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Kudos
1. Sufficient

common factor of z and 12 is 3.

=> there is no 2 in Z . if there is 2 in z , then common factor would have been 6.
=> z has a 3 , but no 2.

for a number to be divisible by 6. its needs to have both 2 and 3.
=> z is not divisible by 6. Enough to answer the question.
Hence Sufficient.

2. Not sufficient

common factor of z and 15 is 15.

=> z has 3 in it.

but we don't know about 2. if z has a 2 , then it will be divisible by 6. if not it wont be divisible by 6.
Not sufficient.

Answer is A.
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Silver89
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Re: This is what I have: Is the integer z divisible by 6? 1) The [#permalink] New post   31 Jul 2011, 18:16
1
Kudos
@Lstadt
i think you solved it in the right way but you have problem in understanding DS
for (is) questions : if the answer is yes OR no, it is Sufficient
if the answer maybe it's NOT sufficient
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Re: This is what I have: Is the integer z divisible by 6? 1) The [#permalink] New post   01 Aug 2011, 13:44
Silver89 wrote:
@Lstadt
i think you solved it in the right way but you have problem in understanding DS
for (is) questions : if the answer is yes OR no, it is Sufficient
if the answer maybe it's NOT sufficient




Oh. I see what you mean. This clarifies it. However, how about the other question that I posted?

Is N divisible by 7?

1) N = x - y, where x and y are integers.
2) x is divisible by 7, and y is not divisible by 7.

The book (MGMT) is saying the answer is C. Does that mean that both statements are sufficient to prove that N is NOT divisible by 7, hence the combining them together will give us a NO answer?
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Silver89
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GPA: 3.2
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Re: This is what I have: Is the integer z divisible by 6? 1) The [#permalink] New post   01 Aug 2011, 13:51
first statement is not sufficient because it is not giving any specific information about N
the second one also not sufficient because it's not telling us anything about N
by combining the two we can find that N= multiple of 7 - not multiple of 7
so it is impossible to be a multiple of 7 and the answer is c
good luck man on you prep
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Silver89
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Re: This is what I have: Is the integer z divisible by 6? 1) The [#permalink] New post   01 Aug 2011, 13:54
Lstadt wrote:
Silver89 wrote:
@Lstadt
i think you solved it in the right way but you have problem in understanding DS
for (is) questions : if the answer is yes OR no, it is Sufficient
if the answer maybe it's NOT sufficient




Oh. I see what you mean. This clarifies it. However, how about the other question that I posted?

Is N divisible by 7?

1) N = x - y, where x and y are integers.
2) x is divisible by 7, and y is not divisible by 7.

The book (MGMT) is saying the answer is C. Does that mean that both statements are sufficient to prove that N is NOT divisible by 7, hence the combining them together will give us a NO answer?

yes man you are on the right way ............
yes or no is sufficient
maybe in not sufficient
i'm studying with MGMAT too :-D
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Lstadt
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Re: This is what I have: Is the integer z divisible by 6? 1) The [#permalink] New post   01 Aug 2011, 14:06
1
Kudos
Silver89 wrote:
Lstadt wrote:
Silver89 wrote:
@Lstadt
i think you solved it in the right way but you have problem in understanding DS
for (is) questions : if the answer is yes OR no, it is Sufficient
if the answer maybe it's NOT sufficient




Oh. I see what you mean. This clarifies it. However, how about the other question that I posted?

Is N divisible by 7?

1) N = x - y, where x and y are integers.
2) x is divisible by 7, and y is not divisible by 7.

The book (MGMT) is saying the answer is C. Does that mean that both statements are sufficient to prove that N is NOT divisible by 7, hence the combining them together will give us a NO answer?

yes man you are on the right way ............
yes or no is sufficient
maybe in not sufficient
i'm studying with MGMAT too :-D



Thanks Silver, I am studying with MGMAT too. I can barely put enough time to finish things but I am really liking their presentation and examples. I have not taken the prep test yet. I need to get a high score. Good luck to you my friend :)



Archived Topic
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 Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: This is what I have: Is the integer z divisible by 6? 1) The [#permalink]
01 Aug 2011, 14:06
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