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The table above shows the number of students in a certain

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The table above shows the number of students in a certain [#permalink] New post 23 Sep 2007, 09:01
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The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?

(1) Of the boys in the class, 15 are studying biology.

(2) The number of girls in the class is twice the number of students in the class who are not studying biology.
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Q30.jpg
Q30.jpg [ 10.43 KiB | Viewed 560 times ]


Last edited by gluon on 24 Sep 2007, 11:17, edited 1 time in total.
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 [#permalink] New post 23 Sep 2007, 09:12
E.
St 1 gives only the total no. of boys.
St. 2 does not provide any concrete information.
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 [#permalink] New post 24 Sep 2007, 11:08
Artemov wrote:
E.
St 1 gives only the total no. of boys.
St. 2 does not provide any concrete information.


This is not correct. Anyone want to give this a try?
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Re: DS: Set 8, Q30 - biology class [#permalink] New post 24 Sep 2007, 15:31
gluon wrote:
The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?

(1) Of the boys in the class, 15 are studying biology.

(2) The number of girls in the class is twice the number of students in the class who are not studying biology.


I think it is B

1. gives number of Boys who study biology, from that we can only find Non biology guys and no other info. so not suff.

2. says that the number of girls is twice the students who do not study biology. look at the chart i attached and work out the following equations

26+x=N
18+2x=N

from there x=8

so number of students is 34
so B
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biology.JPG
biology.JPG [ 6.75 KiB | Viewed 546 times ]

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Re: DS: Set 8, Q30 - biology class [#permalink] New post 24 Sep 2007, 15:43
gluon wrote:
The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?

(1) Of the boys in the class, 15 are studying biology.

(2) The number of girls in the class is twice the number of students in the class who are not studying biology.


B.

(1) Don't know anything about number of girls, cannot determine.
(2) We know that 26+a = Total
18+2a = Total
Therefore, 26+a=18+2a, find a, then find total
SUFFICIENT
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 [#permalink] New post 24 Sep 2007, 17:49
OA is C. But there is no way that is correct. I agree that the correct answer is B.
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Re: DS: Set 8, Q30 - biology class [#permalink] New post 24 Sep 2007, 18:54
Ya this is B. I think S2 intended to say either just girls who don't take bio or boys. Not the total who dont take bio.
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 [#permalink] New post 24 Sep 2007, 20:14
St1:
Insufficient.

St2:
# of students in class = n
# of girls = n-18
# of people not doing biology = n-26

n-18 = 2(n-26)
n-18 = 2n-52
n = 44. Sufficient.

Ans B
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Re: DS: Set 8, Q30 - biology class [#permalink] New post 24 Sep 2007, 21:08
gluon wrote:
The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?

(1) Of the boys in the class, 15 are studying biology.

(2) The number of girls in the class is twice the number of students in the class who are not studying biology.


Yes, This is B. Just plug-in #s in the table..
Re: DS: Set 8, Q30 - biology class   [#permalink] 24 Sep 2007, 21:08
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