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The present ratio of students to teachers at a certain

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The present ratio of students to teachers at a certain [#permalink] New post 23 Jul 2003, 14:37
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The present ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to increase by 50 students and the number of teachers were to increase by 5, the ratio of students to teachers would then be 25 to 1. What is the present number of teachers ?
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Ans. [#permalink] New post 23 Jul 2003, 22:09
Write out what you are given!!

Let Students = S
Let Teachers = T

S/T = 30

(S+50)/(T+5) = 25

combine these two formulas to get T=15
Ans.   [#permalink] 23 Jul 2003, 22:09
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