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On a shelf, books with green cover and that with brown cover are in the ratio 2:3. If there are 18 books with green cover, then the number of books with brown cover is

(A) 12 (B) 24 (C) 27 (D) 36

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(C) 27

From the question it is given that,

On a shelf, books with green cover and that with brown cover are in the ratio 2:3

There are 18 books with green cover

So, let us assume the common factor of 2 and 3 be y.

Then, 2x = 18

X = 18/2

Divide both numerator and denominator by 2.

X = 9

Therefore, the number of books with brown cover is = 3x = 3 × 9

= 27

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