Question

George can read 14 pages of a novel in 30 minutes. at the same rate, how many minutes would it take him to read 420 pages?

Answer 1

$\bf \begin{array}{ccll} pages&minutes\\ \cline{1-2} 14&30\\ 420&m \end{array}\implies \cfrac{14}{420}=\cfrac{30}{m}\implies m=\cfrac{420\cdot 30}{14}\implies m=900$

Answer 2

14/420=30/x

x=(420/14)(30)=900