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In Washington School, 150 students study physics or biology [#permalink]
15 Mar 2012, 15:04

1

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

35% (medium)

Question Stats:

67% (02:11) correct
33% (01:15) wrong based on 168 sessions

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

(1) Of the 150 students, 40 do not study physics. (2) A total of 110 of the students study physics.

I understand the rest of the question apart from the highlighted text. Can someone please try to explain where it fits in the table please? And also, I will appreciate if you can also please let me know how to get D as an answer.

Re: Students who study both? [#permalink]
15 Mar 2012, 18:48

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

(1) Of the 150 students, 40 do not study physics. (2) A total of 110 of the students study physics.

AD|BCE

A: Draw a Venn diagram. 60 of these students do not study biology therefore 60 are exclusively physics students. 40 do not study physics therefore 40 are exclusively biology students. This leaves 50 remaining students that study both.

Since A is confirmed, we evaluate B alone...

B: I started off by drawing a Venn diagram for this one too. If 60 of these students do not study biology then they must do physics (same start as A). Now the statement says a total of 110 students study physics so 110-60= 50. These remaining 50 must study both.

A and B are both valid therefore D is the answer. Please let me know if I'm missing something. Hope that helps. _________________

Re: Students who study both? [#permalink]
16 Mar 2012, 01:03

1

This post received KUDOS

Expert's post

enigma123 wrote:

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

(1) Of the 150 students, 40 do not study physics. (2) A total of 110 of the students study physics.

I understand the rest of the question apart from the highlighted text. Can someone please try to explain where it fits in the table please? And also, I will appreciate if you can also please let me know how to get D as an answer.

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

"150 students study physics or biology or both" means: 150={physics}+{biology}-{both}, we subtract {both} (students who study both physics or biology) since its counted in {physics} as well as in {biology}.

"60 of these students do not study biology" means: 60={physics}-{both} (so 60 study ONLY physics) --> 150=60+{biology} (from above) --> {biology}=90.

Question: {both}=?

(1) Of the 150 students, 40 do not study physics --> 40={biology}-{both} --> 40=90-{both} --> {both}=50. Sufficient.

(2) A total of 110 of the students study physics --> {physics}=110, so from 60={physics}-{both} --> {both}=50. Sufficient.

Re: In Washington School, 150 students study physics or biology [#permalink]
11 Jun 2013, 08:00

1

This post received KUDOS

enigma123 wrote:

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

(1) Of the 150 students, 40 do not study physics. (2) A total of 110 of the students study physics.

I understand the rest of the question apart from the highlighted text. Can someone please try to explain where it fits in the table please? And also, I will appreciate if you can also please let me know how to get D as an answer.

Let a be the number of ONLY physics, b the number of ONLY biology and c the number of both PB.

a+b+c=150 and a=60 so b+c=90, c=?

(1) Of the 150 students, 40 do not study physics. (or study ONLY biology) b=40 => c=50 Sufficient

(2) A total of 110 of the students study physics. a+c=100, c=50 Sufficient _________________

It is beyond a doubt that all our knowledge that begins with experience.

Re: In Washington School, 150 students study physics or biology [#permalink]
13 Oct 2013, 05:13

enigma123 wrote:

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

(1) Of the 150 students, 40 do not study physics. (2) A total of 110 of the students study physics.

I understand the rest of the question apart from the highlighted text. Can someone please try to explain where it fits in the table please? And also, I will appreciate if you can also please let me know how to get D as an answer.

When they say X, Y or both, do they always mean that Neither is zero? Cause I remember seeing a question where this was stated and then had a surprise when in one of the statements it mentioned that neither had a value. Just wondering what is usually the case with this type of wording.

Re: In Washington School, 150 students study physics or biology [#permalink]
14 Oct 2013, 03:56

Expert's post

jlgdr wrote:

enigma123 wrote:

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

(1) Of the 150 students, 40 do not study physics. (2) A total of 110 of the students study physics.

I understand the rest of the question apart from the highlighted text. Can someone please try to explain where it fits in the table please? And also, I will appreciate if you can also please let me know how to get D as an answer.

When they say X, Y or both, do they always mean that Neither is zero? Cause I remember seeing a question where this was stated and then had a surprise when in one of the statements it mentioned that neither had a value. Just wondering what is usually the case with this type of wording.

Thanks for the feedback Cheers J

150 students study physics or biology or both means that no one from these 150 studies neither physics or biology. How else?

Can you please post the link to the question you are talking about? Thank you. _________________

Re: In Washington School, 150 students study physics or biology [#permalink]
14 Oct 2013, 06:43

enigma123 wrote:

In Washington School, 150 students study physics or biology or both. If 60 of these students do not study biology, how many of these students study both physics and biology?

(1) Of the 150 students, 40 do not study physics. (2) A total of 110 of the students study physics.

I understand the rest of the question apart from the highlighted text. Can someone please try to explain where it fits in the table please? And also, I will appreciate if you can also please let me know how to get D as an answer.

Used a table method to solve.

Kudo if it helps

Attachments

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Re: In Washington School, 150 students study physics or biology
[#permalink]
14 Oct 2013, 06:43