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# In a certain school, 40 more than 1/3 of all the students

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Director
Joined: 05 Feb 2006
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In a certain school, 40 more than 1/3 of all the students [#permalink]  22 Oct 2006, 07:27
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Question Stats:

78% (02:48) correct 22% (02:05) wrong based on 92 sessions
In a certain school, 40 more than 1/3 of all the students are taking a science course and 1/4 of those taking a science course are taking physics. If 1/8 of all the students in the school are taking physics, how many students are in the school ?

(A) 240
(B) 300
(C) 480
(D) 720
(E) 960
[Reveal] Spoiler: OA
SVP
Joined: 05 Jul 2006
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Re: In a certain school, 40 more than 1/3 of all the students [#permalink]  22 Oct 2006, 07:45
In a certain school, 40 more than 1/3 of all the students are taking a science course and 1/4 of those taking a science course are taking physics. If 1/8 of all the students in the school are taking physics, how many students are in the school ?

science = 1/3x+40

physics = 1/12 x+10= 1/8x

x+120 = 3/2x thus 0.5 x = 120 thus x = 240
Manager
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Re: In a certain school, 40 more than 1/3 of all the students [#permalink]  23 Oct 2006, 04:48
I got A as well

(40+1/3*x)*1/4=1/8*x

solve for x
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Re: In a certain school, 40 more than 1/3 of all the students [#permalink]  12 Sep 2014, 01:39
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SimaQ wrote:
In a certain school, 40 more than 1/3 of all the students are taking a science course and 1/4 of those taking a science course are taking physics. If 1/8 of all the students in the school are taking physics, how many students are in the school ?

Please show how you construct a formula for this one.... Picking numbers is obvious, so i would like to see formulas... thanks

(A) 240
(B) 300
(C) 480
(D) 720
(E) 960

Let total students = x

Science $$= \frac{x}{3} + 40$$

Physics $$= \frac{1}{4} (\frac{x}{3} + 40)$$

Physics students are $$\frac{1}{8}$$ th of total students; so setting up the equation

$$\frac{1}{4} (\frac{x}{3} + 40) = \frac{x}{8}$$

x = 240

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Re: In a certain school, 40 more than 1/3 of all the students [#permalink]  15 Oct 2014, 20:37
SimaQ wrote:
In a certain school, 40 more than 1/3 of all the students are taking a science course and 1/4 of those taking a science course are taking physics. If 1/8 of all the students in the school are taking physics, how many students are in the school ?

(A) 240
(B) 300
(C) 480
(D) 720
(E) 960

When I saw this question, i thought its a venn diagram question and tried to resolve.
Re: In a certain school, 40 more than 1/3 of all the students   [#permalink] 15 Oct 2014, 20:37
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# In a certain school, 40 more than 1/3 of all the students

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