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

Dear Student

Option (C) is correct here.
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 x.
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


Thanks