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Of the 200 students at College T majoring in one or more of

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Manager
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Of the 200 students at College T majoring in one or more of [#permalink] New post 26 Aug 2008, 22:46
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67% (02:51) correct 33% (01:37) wrong based on 4 sessions
Of the 200 students at College T majoring in one or more of the sciences, 130 are majoring in chemistry and 150 are majoring in biology. If at least 30 of the students are not majoring in either chemistry or biology, then the number of students majoring in both chemistry and biology could be any number from

a) 20 to 50

b) 40 to 70

c) 50 to 130

d) 110 to 130

e) 110 to 150
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Re: PS: Chem/Bio majors (OG #239) [#permalink] New post 26 Aug 2008, 23:05
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D.

let x is # of students common to chemistry and biology, then

(130 -x ) + x + (150 -x) + 30 = 200

x = 110

Since 130 is the number of students who can take chemistry, number of common students cant be more than 130.

Thus D
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Re: PS: Chem/Bio majors (OG #239) [#permalink] New post 26 Aug 2008, 23:14
Total # of science students = 170

chem + bio = 130 + 150 = 280

minimum number of studnets doing both (chem and bio) = 280 - 170 = 110

upper range will be min(130,150)

110 to 130

D
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Re: PS: Chem/Bio majors (OG #239) [#permalink] New post 28 Aug 2008, 07:45
I'm retarded. It was late when I tried this problem. Tried again and I added incorrectly.

130 + 150 - x + 30 = 200

310 - x = 200

x= 110 (min)

max 130 chem students
Re: PS: Chem/Bio majors (OG #239)   [#permalink] 28 Aug 2008, 07:45
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