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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
Solution
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
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