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27 percent of the students at a certain school are boys who are enroll

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Math Revolution GMAT Instructor
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27 percent of the students at a certain school are boys who are enroll  [#permalink]

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New post Updated on: 18 Nov 2017, 16:47
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E

Difficulty:

  35% (medium)

Question Stats:

76% (02:18) correct 24% (03:06) wrong based on 62 sessions

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[GMAT math practice question] 11.17

27 percent of the students at a certain school are boys who are enrolled in an advanced math class. If 60 percent of the boys at the school are enrolled in the advanced math class, what percentage of all students at the school
are boys?

A. 25%
B. 30%
C. 35%
D. 40%
E. 45%

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Originally posted by MathRevolution on 17 Nov 2017, 01:27.
Last edited by MathRevolution on 18 Nov 2017, 16:47, edited 1 time in total.
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Re: 27 percent of the students at a certain school are boys who are enroll  [#permalink]

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New post 17 Nov 2017, 08:34
MathRevolution wrote:
[GMAT math practice question] 11.17

27 percent of the students at a certain school are boys who are enrolled in an advanced math class. If 40 percent of the boys at the school are enrolled in the advanced math class, what percentage of all students at the school
are boys?

A. 25%
B. 30%
C. 35%
D. 40%
E. 45%



Hi..
answer is not in choices..
let total be t and boys be b..
Quote:
27 percent of the students at a certain school are boys who are enrolled in an advanced math class = 40 percent of the boys at the school are enrolled in the advanced math class

\(\frac{27t}{100}=\frac{40b}{100}........\frac{b}{t}=\frac{27}{40}\)
so in % = \(\frac{27}{40}*100=67.5%\)
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Math Revolution GMAT Instructor
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Re: 27 percent of the students at a certain school are boys who are enroll  [#permalink]

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New post 18 Nov 2017, 16:50
chetan2u wrote:
MathRevolution wrote:
[GMAT math practice question] 11.17

27 percent of the students at a certain school are boys who are enrolled in an advanced math class. If 40 percent of the boys at the school are enrolled in the advanced math class, what percentage of all students at the school
are boys?

A. 25%
B. 30%
C. 35%
D. 40%
E. 45%



Hi..
answer is not in choices..
let total be t and boys be b..
Quote:
27 percent of the students at a certain school are boys who are enrolled in an advanced math class = 40 percent of the boys at the school are enrolled in the advanced math class

\(\frac{27t}{100}=\frac{40b}{100}........\frac{b}{t}=\frac{27}{40}\)
so in % = \(\frac{27}{40}*100=67.5%\)


The percentage of the boys enrolled in the advanced math class is fixed to 60%.
Sorry about the confusion.
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6390
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Re: 27 percent of the students at a certain school are boys who are enroll  [#permalink]

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New post 19 Nov 2017, 18:33
Attachment:
11.20.png
11.20.png [ 3.16 KiB | Viewed 618 times ]


\((\frac{45s}{100s})*100 = 45 %\)

Therefore, the answer is E.


Answer : E
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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
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Re: 27 percent of the students at a certain school are boys who are enroll &nbs [#permalink] 19 Nov 2017, 18:33
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