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Of the 50 researchers in a workgroup, 40 percent will be

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New post 20 Aug 2012, 03:11
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Of the 50 researchers in a workgroup, 40 percent will be assigned to Team A and the remaining 60 percent to Team B. However, 70 percent of the researchers prefer Team A and 30 percent prefer Team B. What is the lowest possible number of researchers who will NOT be assigned to the team they prefer?

(A) 15
(B) 17
(C) 20
(D) 25
(E) 30

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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 20 Aug 2012, 03:12
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SOLUTION

Of the 50 researchers in a workgroup, 40 percent will be assigned to Team A and the remaining 60 percent to Team B. However, 70 percent of the researchers prefer Team A and 30 percent prefer Team B. What is the lowest possible number of researchers who will NOT be assigned to the team they prefer?

(A) 15
(B) 17
(C) 20
(D) 25
(E) 30

The number of researchers assigned to Team A will be 0.40*50 = 20;
The number of researchers assigned to Team B will be 0.60*50 = 30.

The number of researchers who prefer Team A will be 0.70*50 = 35;
The number of researchers who prefer Team B will be 0.30*50 = 15.

Now, if ALL 20 spots in Team A, will be filled by the researchers who prefer Team A, then the remaining 15 researchers who prefer Tam A will be assigned to Team B (along with 15 researchers who DO prefer Team B).

Hence, the minimum number of researchers who will NOT be assigned to the team they prefer is 15.

Answer: A.
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 21 Aug 2012, 16:29
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This question would be tough if the wordings of the question are changed from minimum to maximum no of people.

Old Phrasing - What is the lowest possible number of researchers who will NOT be assigned to the team they prefer? = 15 people
New Phrasing - What is the highest possible number of researchers who will NOT be assigned to the team they prefer? = 45 people

I hope these phrasings will help many people to understand the concept in totality
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 20 Aug 2012, 06:33
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IMO A

15 person prefer B and 30 will be assigned to Team B. All preference for Team B are fulfilled.
35 Person prefer A and only 20 will be assigned to Team A and rest 15 person will be forced to join team B.
So (35-20)=15 will not get their preference.
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 23 Aug 2012, 09:48
Team A (20) Team B (30)
Pref Team A (35), Team B (15)
20/35 => gets pref team A.
15/30 => gets pref team B
That’s 20+15 getting pref team:15 Remaining - Answer
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 10 Sep 2012, 20:43
I think I sort of understand this one. Why does the question ask for "lowest#?"
Will there be a big difference between lowest and highest?
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 11 Sep 2012, 11:46
grignard wrote:
I think I sort of understand this one. Why does the question ask for "lowest#?"
Will there be a big difference between lowest and highest?


Nice question...

what we have calculated is, atleast, 15 % people are those who has been assigned to the team which they didnt prefer, it may b more than that rite? like we dont know actually the people who has been assigned to teams are actually assigend to preferd team, it may b more than, but atleast 15% person, not less than that..

M i rite guyz??
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New post 14 Nov 2012, 06:03
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Hi Bunuel,

How to solve this using Double set Matrix?

Regards,
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 23 Dec 2012, 06:59
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Sachin9 wrote:
Hi Bunuel,

How to solve this using Double set Matrix?

Regards,
Sachin



Even if you use a double set matrix, it will be quite irrelevant as its slightly modified. But if you draw the matrix it will be clear what the question is asking you!
Attachments

File comment: matrix diagram
Og_prob.jpg
Og_prob.jpg [ 31.25 KiB | Viewed 33604 times ]


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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 06 Feb 2013, 06:12
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A great way to solve this is to use the Double-Matrix Chart

------------Team A|Team B
prefer A|______|__________=.7 * 50 = 35
prefer B|______|__________=.3 * 50 = 15
________________________________
----------.4*50=20 + .6*50=30-----------= 50

Columns:
20 people should be assigned to A.
30 people should be assigned to B.

Rows:
35 prefer Team A.
15 prefer Team B.

All totaling to 50.

In order to get the lowest number who will not get what they want,
we give the assignment to those who wants it as much as we can.

For example:
If 35 wants Team A... assign as much as we can to Team A.
If 15 wants Team B... assign as much as we can to Team B.

(See table below)

------------Team A|Team B
prefer A|___20_|___?_______=.7 * 50 = 35
prefer B|___?__|__15_______=.3 * 50 = 15
________________________________
---------------20---+----30--------= 50

Now we calculate the balance of those who did not get the slot...

------------Team A|Team B
prefer A|___20_|___15_______=.7 * 50 = 35
prefer B|___0__|__15_______=.3 * 50 = 15
________________________________
---------------20---+----30--------= 50

Note that the row of "prefer A" should always tally to 35. That is why we know the balance is 15.
Note that the row of "prefer B" should always tally to 15. That is why we know the balance is 0.



Now we sum up those who did not get what they want:

15 on those who prefer A did not get it
0 on those who prefer B did not get it.


Answer: 15

This chart works on all overlapping set problems...
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 20 Feb 2014, 13:23
I actually solved it using a different logic and got the right answer, however I might have just gotten lucky. Please if there is a mistake in my logic, let me know.

People assigned to team A = 20
People assigned to tean B = 30

35 People wanted team A.
15 people wanted team B.

I got the answer from team B. 30 - 15= 15 since there were 30 people and only 15 wanted to be there. so the rest did not.
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 19 Jul 2014, 20:04
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Sachin9 wrote:
Hi Bunuel,

How to solve this using Double set Matrix?

Regards,
Sachin


Matrix based on the question:
Attachment:
matrix.png
matrix.png [ 2.6 KiB | Viewed 29527 times ]


The question is asking us to make x+y minimum.

If you make y=0, x will become 15
So, x+y = 15
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New post 23 Jul 2014, 23:02
Assigned to A = 20

Assigned to B = 30

Preferred A = 35

Preferred B = 15

Least = 35 - 20 OR 30 - 15 = 15

Answer = A
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 10 Sep 2014, 02:27
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Of the 50 researchers in a workgroup, 40 percent will be assigned to Team A and the remaining 60 percent to Team B. However, 70 percent of the researchers prefer Team A and 30 percent prefer Team B. What is the lowest possible number of researchers who will NOT be assigned to the team they prefer?

(A) 15
(B) 17
(C) 20
(D) 25
(E) 30

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Page: 155
Difficulty: 600


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Team A..40% of 50 = 20
Team B..60% of 50 = remaining 30.
but 70% of researcher prefer A i.e 35

so out of 35 only 20 ppl got allocated to preferred one hence 15 hasn't
it would be the same story for ppl who preferred Team B as well.

Answer A
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New post 16 Nov 2014, 07:55
I solved it by assuming 100 people and then dividing my answer in two to save time on calculations. (percentage equals number of people) In that case
40 will be in team A
60 will be in team B

The larger diff is
70 want team A so diff is 70-40=30. At least 30 people will NOT get their wish, so for 50 researchers the same number is 15.
Answer choice A
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 11 Jan 2015, 07:20
I did the same with the matrix.

However, in the end I just said:

(assigned to B) - preferred B = 30 - 15 = 15
(preferred A - assigned to A) = 35 - 20 = 15

So, in every case, at least 15 people will be assigned to a group they don't like.
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 06 Mar 2016, 21:20
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[quote="Bunuel"]Of the 50 researchers in a workgroup, 40 percent will be assigned to Team A and the remaining 60 percent to Team B. However, 70 percent of the researchers prefer Team A and 30 percent prefer Team B. What is the lowest possible number of researchers who will NOT be assigned to the team they prefer?

(A) 15
(B) 17
(C) 20
(D) 25
(E) 30

Here Total team =50
Allowed in A = 20
Allowed in B = 30
Want A=35
Want B=15

To find the least that don't get there preference => let us arrange them in a way that all get what they want
here B members are fully fit in B=> no left
but For A => 20 seats and 35 need them .
SO 15 will have no place to go ; hence they will be assigned to team B.
Thus => 15.
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 07 Mar 2016, 02:46
ziko wrote:
fameatop wrote:
This question would be tough if the wordings of the question are changed from minimum to maximum no of people.

Old Phrasing - What is the lowest possible number of researchers who will NOT be assigned to the team they prefer? = 15 people
New Phrasing - What is the highest possible number of researchers who will NOT be assigned to the team they prefer? = 45 people

I hope these phrasings will help many people to understand the concept in totality


Could you please explain how to work on the second question?


here let me make that simple for you
Maximum number of people who wont get the team they prefer.
So let us try and distribute the team in a way none get what they want.

=> In this case => out of 35 30 will be given to Team B and rest team A
hence 5 people only get what they want.
Number of people who dont get what they want => 50-5 = 45.

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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 25 May 2016, 07:15
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Bunuel wrote:
Of the 50 researchers in a workgroup, 40 percent will be assigned to Team A and the remaining 60 percent to Team B. However, 70 percent of the researchers prefer Team A and 30 percent prefer Team B. What is the lowest possible number of researchers who will NOT be assigned to the team they prefer?

(A) 15
(B) 17
(C) 20
(D) 25
(E) 30


We are given that there are a total of 50 researchers in the workgroup and that 40% will be assigned to team A and 60% assigned to team B. Thus, we know:

Assigned to team A = (0.4)(50) = 20

Assigned to team B = (0.6)(50) = 30

We are also given that 70% of the people PREFER team A and that 30% of the people PREFER team B. Thus we know:

Prefer team A = (0.7)(50) = 35

Prefer team B = (0.3)(50) = 15

We are asked to find the LOWEST POSSIBLE NUMBER of people who will NOT be assigned to the team they prefer. Let’s start with team B.

Currently we have 15 people who PREFER team B and 30 people who will be assigned to team B. Because we are looking for the lowest possible number of people who will not be assigned to the team they prefer, we must assume that all 15 people who prefer team B will indeed be assigned to team B, but this means that, of the 30 people who will be on team B, 15 of them DO NOT WANT TO BE ON THE TEAM.

Turning to team A, we know that we have 35 people who PREFER team A and 20 people who will be assigned to team A. Again we are looking for the lowest possible number of people who will not be assigned to the team they prefer, we must assume that all 20 people who will be on team A actually prefer to be on that team.

Thus the lowest number of people who do not prefer the team in which they have been assigned is 15 people.

Note that the answer is NOT 30. Don't be guilty of double-counting the disappointed people. Think instead that all 20 people assigned to team A wanted to be on it, and of the 30 people assigned to team B, exactly 15 wanted to be on it. Thus, we have 35 people who got the team they wanted, with 15 who were assigned to the team they didn't want.

Answer A.
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Re: Of the 50 researchers in a workgroup, 40 percent will be  [#permalink]

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New post 09 Jun 2017, 06:10
fameatop wrote:
This question would be tough if the wordings of the question are changed from minimum to maximum no of people.

Old Phrasing - What is the lowest possible number of researchers who will NOT be assigned to the team they prefer? = 15 people
New Phrasing - What is the highest possible number of researchers who will NOT be assigned to the team they prefer? = 45 people

I hope these phrasings will help many people to understand the concept in totality


How did you solve the second one?
Can anyone please explain this?
Also can we make venn diagram in this question?


Thanks
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Re: Of the 50 researchers in a workgroup, 40 percent will be   [#permalink] 09 Jun 2017, 06:10

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