Quantitative Aptitude :: Problems on Numbers - Discussion

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Explanation:
Given the ratio of students and teachers = 30:1
=> students and teachers are in school 30x, x respectively.

After new recruitments of students and teachers the strength becomes (30x + 50), (x + 5) respectively.
So, the new ratio = 25 : 1
(30x + 50)/(x + 5) = 25/1
=> 30x + 50 = 25x + 125
=> 5x = 75 => x = 15