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

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Director
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Joined: 05 Feb 2006
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In a certain school, 40 more than 1/3 of all the students [#permalink] New post 22 Oct 2006, 07:27
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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
SVP
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 [#permalink] New post 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
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 [#permalink] New post 23 Oct 2006, 04:48
I got A as well

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

solve for x
  [#permalink] 23 Oct 2006, 04:48
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