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In College X the number of students enrolled in both a

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In College X the number of students enrolled in both a chemistry course and a biology course is how much less than the number of students enrolled in neither?

(1) In College X there are 60 students enrolled in a chemistry course.
(2) In College X there are 85 students enrolled in a biology course.

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SOLUTION

In College X the number of students enrolled in both a chemistry course and a biology course is how much less than the number of students enrolled in neither?

{Total} = {Chemistry} + {Biology} - {Both} + {Neither}.

The question asks to calculate {Neither} - {Both}.

(1) In College X there are 60 students enrolled in a chemistry course. {Chemistry} = 60. Not sufficient.
(2) In College X there are 85 students enrolled in a biology course. {Biology} = 85. Not sufficient.

(1)+(2) {Chemistry} = 60 and {Biology} = 85. Still not sufficient to get {Neither} - {Both}.

Answer: E.
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Re: In College X the number of students enrolled in both a [#permalink]

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New post 25 Jul 2012, 23:16
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Unless we know the total population and/or overlapping set, we will not be able to find the difference between neither and both.

Hence E.

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We're being asked how many the students are that enrolled in both Ch and Bio in comparison to the ones that did not enroll in any of the two classes.

In statement 1 we're given the amount of Ch students. We're still in need of Bio and the students that didn't enroll in any of the two classes.

Statement 2 gives us the amount of Bio students. We're still missing the last part with students that did not enroll in any.

Hence, E.

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Re: In College X the number of students enrolled in both a [#permalink]

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New post 10 Sep 2015, 23:21
BOTH the statements are inconclusive as they do not give any information about
1 . total no of students
2 overlapping set
3. null set

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Re: In College X the number of students enrolled in both a [#permalink]

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New post 02 Jul 2016, 00:16
What would be the answer if the total was given in the question?

Total= Set A + Set B - intersection. Isn't this sufficient to calculate total? Do we need neither. Neither can be zero, can't it?

I would have gone with C if total was given.

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Re: In College X the number of students enrolled in both a [#permalink]

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New post 07 Jul 2016, 04:55
Bunuel wrote:
In College X the number of students enrolled in both a chemistry course and a biology course is how much less than the number of students enrolled in neither?

(1) In College X there are 60 students enrolled in a chemistry course.
(2) In College X there are 85 students enrolled in a biology course.

Practice Questions
Question: 5
Page: 275
Difficulty: 650



x+y - both + neither

we just have x and y
nothing else
so we cannot solve this one
E

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Re: In College X the number of students enrolled in both a [#permalink]

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New post 22 Jul 2016, 11:54
Bunuel wrote:
In College X the number of students enrolled in both a chemistry course and a biology course is how much less than the number of students enrolled in neither?

(1) In College X there are 60 students enrolled in a chemistry course.
(2) In College X there are 85 students enrolled in a biology course.


An easy way to solve this problem is to set up a double set matrix. In our matrix, we have two main categories: biology and chemistry. More specifically, our table will be labeled with:

1) Number of people who are enrolled in chemistry (Chem)

2) Number of people who are not enrolled in chemistry (No Chem)

3) Number of people who are enrolled in biology (Bio)

4) Number of people who are not enrolled in biology (No Bio)

(To save room on our table headings we will use the abbreviations for the categories.)

We need to determine the difference between the number of students who are enrolled in both chemistry and biology and the number of students who are enrolled in neither course.

Although we are not provided any given information, we can create our table.

Image

Statement One Alone:

In College X there are 60 students enrolled in a chemistry course.

Let’s fill the information from statement one into our table.

Image

The information in statement one is not enough to answer the question. We can eliminate answer choices A and D.

Statement Two Alone:

In College X there are 85 students enrolled in a biology course.

Image

The information in statement two is not enough to answer the question. We can eliminate answer choice B.

Statements One and Two Together:

Image

Without more information, we cannot answer the question.

Answer: E
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Re: In College X the number of students enrolled in both a [#permalink]

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New post 30 Sep 2016, 12:26
E it is. I end up spending a lot of time in this kind of questions to figure out what the catch is (ultimately find that there is none)


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Re: In College X the number of students enrolled in both a [#permalink]

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New post 09 Dec 2016, 14:46
It is clear that statements (a), (b) do not help in answering the question. (a) + (b) too, is insufficient.
Answer: E

Hope the representation helps.
Attachments

B1.PNG
B1.PNG [ 5.23 KiB | Viewed 5718 times ]


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Re: In College X the number of students enrolled in both a [#permalink]

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New post 09 Jun 2017, 06:47
In official guide, several values are being tested before eliminating an answer choice. When should we really test value? Or should we always test values ?
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Re: In College X the number of students enrolled in both a [#permalink]

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New post 09 Jun 2017, 11:59
Imo E
We can not arrive at the solution from both of these statements
We need total number of students and number of students who went to both the classes.

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Re: In College X the number of students enrolled in both a [#permalink]

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New post 09 Jun 2017, 22:12
In College X the number of students enrolled in both a chemistry course and a biology course is how much less than the number of students enrolled in neither?

(1) In College X there are 60 students enrolled in a chemistry course.
(2) In College X there are 85 students enrolled in a biology course.

Refer the attached file .

Regards,

press kudos if you like my post .
Attachments

File comment: Solution
og.png
og.png [ 22.12 KiB | Viewed 3026 times ]

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Re: In College X the number of students enrolled in both a [#permalink]

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New post 09 Aug 2017, 13:38
Is this really a 600-650 level question?

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Re: In College X the number of students enrolled in both a [#permalink]

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New post 08 Oct 2017, 09:03
bfistein wrote:
Is this really a 600-650 level question?


Hate to gravedig, but I'm curious myself

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Re: In College X the number of students enrolled in both a   [#permalink] 08 Oct 2017, 09:03
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