Question

At a bookstore, 8 similar books cost y dollars. what is the price of 3 such books?

Answer 1

`\bf \begin{array}{ccll} books&price\\ \cline{1-2} 8&y\\ 3&x \end{array}\implies \cfrac{8}{3}=\cfrac{y}{x}\implies 8x=3y\implies x=\cfrac{3}{8}y`