Question

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 ______.

Options

• 12

• 24

• 27

• 36

Answer 1

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 27.

Explanation:

Given, Ratio of books with green cover to books with brown cover = 2 : 3

Books with green cover = 18

Let the books with green cover and brown cover are 2x and 3x respectively.

Given, 2x = 18

⇒ x = `18/2`

⇒ x = 9

Thus, the books with brown cover = 3x

= 3 × 9

= 27