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In Washington School, 150 students study physics or biology

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In Washington School, 150 students study physics or biology [#permalink] New post 15 Mar 2012, 15:04
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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.
[Reveal] Spoiler: OA

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

Answer: D.
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Re: In Washington School, 150 students study physics or biology [#permalink] New post 16 Mar 2012, 01:29
+1 D

I used the ven dig to solve this

Got P=110 in the first statement & this is also given in the 2nd statement. Thus D
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Re: In Washington School, 150 students study physics or biology [#permalink] New post 11 Jun 2013, 06:27
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Bumping for review and further discussion*. Get a kudos point for an alternative solution!

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

Thanks for the feedback
Cheers
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Re: In Washington School, 150 students study physics or biology [#permalink] New post 14 Oct 2013, 03:56
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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.
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RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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