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Six countries in a certain region sent a total of 75

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Six countries in a certain region sent a total of 75 [#permalink]

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Six countries in a certain region sent a total of 75 representatives to an international congress, and no two countries sent the same number of representatives. Of the six countries, if Country A sent the second greatest number of representatives, did Country A send at least 10 representatives?

(1) One of the six countries sent 41 representatives to the congress
(2) Country A sent fewer than 12 representatives to the congress
[Reveal] Spoiler: OA
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Re: GMAT PREP (DS) [#permalink]

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Six countries in a certain region sent a total of 75 representatives to an international congress, and no two countries sent the same number of representatives. Of the six countries, if Country A sent the second greatest number of representatives, did Country A send at least 10 representatives?

Given: \(x_1<x_2<x_3<x_4<A<x_6\) and \(x_1+x_2+x_3+x_4+A+x_6=75\). Q: is \(A\geq{10}\)

(1) One of the six countries sent 41 representatives to the congress --> obviously \(x_6=41\) --> \(x_1+x_2+x_3+x_4+A=34\).

Can \(A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\) --> \(sum=34\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\) --> \(sum=34\) (answer to the question NO).

(2) Country A sent fewer than 12 representatives to the congress --> \(A<{12}\).

The same breakdown works here as well:
Can \(12>A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\), \(x_6=41\) --> \(sum=75\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\), \(x_6=41\) --> \(sum=75\) (answer to the question NO).

(1)+(2) The given examples fit in both statements and A in one is more than 10 and in another less than 10. Not sufficient.

Answer: E.
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Re: GMAT PREP (DS) [#permalink]

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New post 28 Apr 2010, 03:21
Bunuel wrote:
Six countries in a certain region sent a total of 75 representatives to an international congress, and no two countries sent the same number of representatives. Of the six countries, if Country A sent the second greatest number of representatives, did Country A send at least 10 representatives?

Given: \(x_1<x_2<x_3<x_4<A<x_6\) and \(x_1+x_2+x_3+x_4+A+x_6=75\). Q: is \(A\geq{10}\)

(1) One of the six countries sent 41 representatives to the congress --> obviously \(x_6=41\) --> \(x_1+x_2+x_3+x_4+A=34\).

Can \(A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\) --> \(sum=34\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\) --> \(sum=34\) (answer to the question NO).

(2) Country A sent fewer than 12 representatives to the congress --> \(A<{12}\).

The same breakdown works here as well:
Can \(12>A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\), \(x_6=41\) --> \(sum=75\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\), \(x_6=41\) --> \(sum=75\) (answer to the question NO).

(1)+(2) The given examples fit in both statements and A in one is more than 10 and in another less than 10. Not sufficient.

Answer: E.


Excellent explanation. Thanks very much.
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Re: GMAT PREP (DS) [#permalink]

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Bunuel wrote:
Six countries in a certain region sent a total of 75 representatives to an international congress, and no two countries sent the same number of representatives. Of the six countries, if Country A sent the second greatest number of representatives, did Country A send at least 10 representatives?

Given: \(x_1<x_2<x_3<x_4<A<x_6\) and \(x_1+x_2+x_3+x_4+A+x_6=75\). Q: is \(A\geq{10}\)

(1) One of the six countries sent 41 representatives to the congress --> obviously \(x_6=41\) --> \(x_1+x_2+x_3+x_4+A=34\).

Can \(A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\) --> \(sum=34\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\) --> \(sum=34\) (answer to the question NO).

(2) Country A sent fewer than 12 representatives to the congress --> \(A<{12}\).

The same breakdown works here as well:
Can \(12>A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\), \(x_6=41\) --> \(sum=75\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\), \(x_6=41\) --> \(sum=75\) (answer to the question NO).

(1)+(2) The given examples fit in both statements and A in one is more than 10 and in another less than 10. Not sufficient.

Answer: E.


Why and how is it obvious that obviously \(x_6=41\)
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Re: GMAT PREP (DS) [#permalink]

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LM wrote:
Bunuel wrote:
Six countries in a certain region sent a total of 75 representatives to an international congress, and no two countries sent the same number of representatives. Of the six countries, if Country A sent the second greatest number of representatives, did Country A send at least 10 representatives?

Given: \(x_1<x_2<x_3<x_4<A<x_6\) and \(x_1+x_2+x_3+x_4+A+x_6=75\). Q: is \(A\geq{10}\)

(1) One of the six countries sent 41 representatives to the congress --> obviously \(x_6=41\) --> \(x_1+x_2+x_3+x_4+A=34\).

Can \(A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\) --> \(sum=34\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\) --> \(sum=34\) (answer to the question NO).

(2) Country A sent fewer than 12 representatives to the congress --> \(A<{12}\).

The same breakdown works here as well:
Can \(12>A\geq{10}\): \(x_1=2\), \(x_2=3\), \(x_3=8\), \(x_4=10\), \(A=11\), \(x_6=41\) --> \(sum=75\) (answer to the question YES);
Can \(A<{10}\): \(x_1=4\), \(x_2=6\), \(x_3=7\), \(x_4=8\), \(A=9\), \(x_6=41\) --> \(sum=75\) (answer to the question NO).

(1)+(2) The given examples fit in both statements and A in one is more than 10 and in another less than 10. Not sufficient.

Answer: E.


Why and how is it obvious that obviously \(x_6=41\)


Only the country which sent greatest number of representatives (\(x_6\)) could have sent 41, as 41 is more than half of the total (75).
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Re: GMAT PREP (DS) [#permalink]

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Thanks for the explanation

I got tripped when doing this in GMAT Prep as well.
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Re: GMAT PREP (DS) [#permalink]

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I understand by putting the values we can get but during exam its tough to out so many values and get it. I am thinking can there any other simpler and quick solution.

Putting values like 4,6,7,8 and 11 is not easy.
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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New post 18 Apr 2012, 19:36
Thank you bunnel for the explanation.
I must remember to solve it logically. and see when it does fit (a = 10) and when it is not true (a=9)
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Re: GMAT PREP (DS) [#permalink]

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sourabhsoni wrote:
I understand by putting the values we can get but during exam its tough to out so many values and get it. I am thinking can there any other simpler and quick solution.

Putting values like 4,6,7,8 and 11 is not easy.


It is when you have a plan! You should know how to manipulate numbers and examples.
Let me explain.

6 countries, 75 people. No 2 countries sent the same number of people.

Stmnt 1: One country sent 41 people.
The other 5 together sent 75 - 41 = 34 people. 'A' sent the most number of people from the remaining 5 countries. Does A need to send atleast 10?
34 divided by 5 is approximately 7. On average, every country sent 7 people so we can split it like 4, 6, 7, 8, 9 (try and split around 7 so that the average stays apprx 7). A sent 9 people here.
A could have sent more than 10 people of course (say if the other 4 countries sent 1, 2, 3 and 4)
Not sufficient.

Stmnt 2: A sent fewer than 12
A could have sent 9 people (example above) or 11 (Split is 2, 6, 7, 8, 11. Try to make minimum changes to get what you want so that you can minimize the chances of error. Since I want to increase the last number, I just reduce the first one appropriately).
Again, not sufficient.

Using both statements together, A could have sent 9 or 11 people so not sufficient.

Answer (E)
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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Great explanation, I need to spend time checking to prove and disprove these type of questions. For some reason I have a bad habit of rushing DS questions and not thinking through.
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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New post 30 Oct 2012, 11:52
Bunuel,
Sorry :s for making this question again hehe:
Is this a word problem question or another type of question? I cannot recognize it using the MGMAT guides.
Could you provide me more links related or tell me how to find them?
Thank you! :)
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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danzig wrote:
Bunuel,
Sorry :s for making this question again hehe:
Is this a word problem question or another type of question? I cannot recognize it using the MGMAT guides.
Could you provide me more links related or tell me how to find them?
Thank you! :)



Yes, it's a word problem but also a bit like min/max type of question.

You can find all kinds of questions in our question banks here: viewforumtags.php

DS min/max questions: search.php?search_id=tag&tag_id=42
PS min/max questions: search.php?search_id=tag&tag_id=63

Hope it helps.
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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New post 16 Jun 2013, 01:33
Thx for the answer!
But I still have a question,,,,,,,
Since the question we need to anwer is : did A at least send 10 representitives?
so if I can conclude tht : yes,A at least sent 10. it is sufficient.
if I conclude tht: no, A didn't not at least send 10. it is also sufficient.
Because GMAC says if we can hve one specific answer, it is sufficient.

Well, when I consider(1), clearly I can say that: no, A didn't not at least send 10.

then why not choose A?????? :?:
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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KimY wrote:
Thx for the answer!
But I still have a question,,,,,,,
Since the question we need to anwer is : did A at least send 10 representitives?
so if I can conclude tht : yes,A at least sent 10. it is sufficient.
if I conclude tht: no, A didn't not at least send 10. it is also sufficient.
Because GMAC says if we can hve one specific answer, it is sufficient.

Well, when I consider(1), clearly I can say that: no, A didn't not at least send 10.

then why not choose A?????? :?:


In a Yes/No Data Sufficiency questions, statement is sufficient if the answer is “always yes” or “always no” while a statement is insufficient if the answer is "sometimes yes" and "sometimes no".

For the first statement we can have an YES as well as a No answer to the question, which means that the statement is NOT sufficient.

For example, check here: six-countries-in-a-certain-region-sent-a-total-of-93368.html#p718376 or here: six-countries-in-a-certain-region-sent-a-total-of-93368.html#p1075895

Hope it helps.
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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I took one good look at this problem and had the word "guess" in my head. After doing this problem again, I realized that it was not as difficult as it first looked. The GMAT is definitely beatable! Not giving up.
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Re: Six countries in a certain region sent a total of 75 [#permalink]

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Re: Six countries in a certain region sent a total of 75 [#permalink]

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Well this question is really a good one!

I got E, but I wasn't too sure about this answer. The best way to do such questions is asking yourself whether it is possible for you to answer what has been asked.

Bunuel's approach is excellent, but I think it would require at least 3-3.5 mins of working.
Re: Six countries in a certain region sent a total of 75   [#permalink] 19 Dec 2015, 00:30
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