Question

1. In a library 136 copies of certain book require a shelf - length of 13.6m. How many
copies of the same book would occupy a shelf-length of 5.1 m?​

Answer 1

Answer:

Let x be the number of copies that would occupy a self-length of 5.1m.

Number of copies 136 x

Length the self ( in m ) 3.4 5.1

Since, the number of copies and the length of the shelf are in direct variation.

∴ x=136 = 5.1 3.4

⇒ 136×5.1=x×3.4

⇒ x= 3.4

136×5.1

⇒ x=204

∴ 204 copies will occupy a shelf of length 5.1m.