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

Answer 1

Let the common multiple of 2 and 3 be x. then:
ratio= 2x:3x
it is given that books with green color are 18 in number. The ratio is 2x. So we come to know that :
2x= 18
x=18/2
=9
If x= 9, the books with green cover = 3x= 3*9
=27 
:) 

Answer 2

The number of books with brown cover is 27.

Step-by-step explanation:

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

Let the ratio be 'x'.

So, the green covers are 2x and brown covers are 3x.

If there are 18 books with green cover.

i.e. $2x=18$

$x=\frac{18}{2}$

$x=9$

The number of brown covers are

$3x=3\times 9=27$

Therefore, the number of books with brown cover is 27.

#Learn more

1. On a shelf there are green books and brown books. They are in the ratio 2:3. If number of green books is 18, what is the number of brown books?

2. If there are red marbles and blue marbles in a box in the ratio 7:4, find the total number of marbles.

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