Question

Question 7

Only one of the four options is correct. Write the correct one.

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

Answer 1

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 be 2x and 3x respectively.
According to the question,
$2x=18\Rightarrow x=\frac{18}{2}\Rightarrow x=9$
Thus, the books with brown cover = 3x
$=3\times 9=27$
Hence, (c) is the correct option.