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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
Joined: 16 Aug 2015
Posts: 5079
GMAT 1: 800 Q59 V59
GPA: 3.82
27 percent of the students at a certain school are boys who are enroll [#permalink]

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17 Nov 2017, 01:27
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Difficulty:

35% (medium)

Question Stats:

66% (02:03) correct 34% (01:32) wrong based on 50 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%
[Reveal] Spoiler: OA

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
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"Only $79 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Last edited by MathRevolution on 18 Nov 2017, 16:47, edited 1 time in total. Math Expert Joined: 02 Aug 2009 Posts: 5732 Re: 27 percent of the students at a certain school are boys who are enroll [#permalink] ### Show Tags 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 % = $$\frac{27}{40}*100=67.5%$$ _________________ Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372 Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html GMAT online Tutor Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 5079 GMAT 1: 800 Q59 V59 GPA: 3.82 Re: 27 percent of the students at a certain school are boys who are enroll [#permalink] ### Show Tags 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$79 for 3 month Online Course"
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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 5079
GMAT 1: 800 Q59 V59
GPA: 3.82
Re: 27 percent of the students at a certain school are boys who are enroll [#permalink]

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19 Nov 2017, 18:33
Attachment:

11.20.png [ 3.16 KiB | Viewed 378 times ]

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

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
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Re: 27 percent of the students at a certain school are boys who are enroll   [#permalink] 19 Nov 2017, 18:33
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