Question

On shelf ,books with red cover and that with blue cover are in the ratio 2:5 . if there are 28 books with red colour ,find the number of books with blue colour .

Answer 1

Given:

On-shelf, books with a red cover and that with a blue cover are in the ratio 2:5.

There are 28 books with red colour

To find:

The number of books with a blue colour

Solution:

Let,

"2x" → represents the number of books with the red cover

"5x" → represents the number of books with the blue cover

The number of books with the red cover is given as 28.

∴ $2x = 28$

$\implies x = \frac{28}{2}$

$\implies \bold{x = 14}$

∴ 5x = 5 × 14 = 70

Thus, the number of books with a blue colour cover is → 70.

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