Question

On a shelf
, books with grey cover and that with brown cover are in the ratio 3:5. If there are 30 books with gre
cover, then find the number of books with brown cover?​

Answer 1

Given :

• Ratio of grey to brown cover = 3:5
• Total grey book = 30

To Find :

• Brown cover book.

SoluTion :-

Let's assume that the total brown cover book be x.

$\implies\sf \dfrac{3}{5} = \dfrac{30}{x}$

• Cross multiplication

$\implies\sf 3 \times x = 30 \times 5$

$\implies\sf \: 3x = 150$

$\implies\sf \: x = \cancel { \dfrac{150}{3}}$

$\implies \boxed {\bf {x \: = 50}}$

$\huge{\therefore}$There are 50 brown cover book.