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Every student of a certain school must take one and only one elective
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18 Nov 2022, 08:37
18 Nov 2022, 08:37
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Every student of a certain school must take one and only one elective course. In last year, 1/2 of the students took biology as an elective, 1/3 of the students took chemistry as an elective, and all of the other students took physics. In this year, 1/3
of the students who took biology and 1/4 of the students who took chemistry left school, other students did not leave, and no fresh student come in. What fraction of all students took biology and took chemistry?
A. 7/9
B .6/7
C.5/7
D.4/9
E.2/5
of the students who took biology and 1/4 of the students who took chemistry left school, other students did not leave, and no fresh student come in. What fraction of all students took biology and took chemistry?
A. 7/9
B .6/7
C.5/7
D.4/9
E.2/5
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Free Materials for the GRE General Exam - Where to get it!!
GRE Geometry Formulas
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Re: Every student of a certain school must take one and only one elective
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19 Nov 2022, 02:26
19 Nov 2022, 02:26
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Expert Reply
Let's pick smart numbers. Total number of students: 12
Biology (1/2): 6
Chemistry (1/3): 4
Physics (1/6): 2
After leaving school
Biology: 4
Chemistry: 3
Physics: 2
New Total number of students: 9
Biology and Chemistry: 7
Answer: A
Biology (1/2): 6
Chemistry (1/3): 4
Physics (1/6): 2
After leaving school
Biology: 4
Chemistry: 3
Physics: 2
New Total number of students: 9
Biology and Chemistry: 7
Answer: A
gmatclubot
Re: Every student of a certain school must take one and only one elective [#permalink]
19 Nov 2022, 02:26
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