In a library, the ratio of the books on Computer, Physics and Mathematics is 5:7:8. If the collection of books is increased respectively by 40%, 50% and 75%, find out the new ratio:
(A) 3:9:5
(B) 7:5:3
(C) 2:3:4
(D) 2:5:4


Answer: (C)

Explanation: 40% increase will lead to a factor of 140 and similiarly 150 and 175

so new ratio is

(5*140):(7*150):(8*175)

on solving we get 2:3:4

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