Question

In a library 136 copies of a certain book require a shelf-length of 3.4 metre. How many copies of the same book would occupy a shelf length of 5.1 metres?

Answer 1

Let the number of copies be x

Self - length(m)	3.4	5.1
No of copies	136	x

\(\frac{3.4}{136}\) = \(\frac{5.1}{x}\)

On cross multiplication, we get

3.4x = 5.1 x 136

x = \(\frac{5.1\times 136}{3.4}\) = 204

Therefore number of copies is 204