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At a certain school, is the number of biology students greater than th

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At a certain school, is the number of biology students greater than th  [#permalink]

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08 Nov 2018, 13:07
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72% (01:02) correct 28% (01:06) wrong based on 49 sessions

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At a certain school, is the number of biology students greater than the number of chemistry students?

(1) Of the biology students, 30 percent are also chemistry students.
(2) Of the chemistry students, 40 percent are also biology students.

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Re: At a certain school, is the number of biology students greater than th  [#permalink]

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09 Nov 2018, 04:49
2
The question is X>Y?
St 1: Of the biology students, 30 percent are also chemistry students.
Not sufficient to established the relationship between X and Y
Not sufficient.
St:-2 Of the chemistry students, 40 percent are also biology students.
Not sufficient to established the relationship between X and Y
Not sufficient.

Combination:
0.3x =0.4Y
X/Y=4/3
So X>Y sufficient.

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Re: At a certain school, is the number of biology students greater than th  [#permalink]

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27 Nov 2018, 01:23
vishalkazone wrote:
The question is X>Y?
St 1: Of the biology students, 30 percent are also chemistry students.
Not sufficient to established the relationship between X and Y
Not sufficient.
St:-2 Of the chemistry students, 40 percent are also biology students.
Not sufficient to established the relationship between X and Y
Not sufficient.

Combination:
0.3x =0.4Y
X/Y=4/3
So X>Y sufficient.

Isn't that true only if we assume that the total number of students in the classes is the same? If we assume, for instance, 200 students in the chemistry class and 100 in biology class, we get a different result (more chemistry than biology students).
What am I getting wrong?
Re: At a certain school, is the number of biology students greater than th   [#permalink] 27 Nov 2018, 01:23
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