Question

If you buy 6 boxes of cereal for $10, how much will 9 boxes of cereal cost?

Answer 1

`\bf \begin{array}{ccllll} amount&\$\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 6&10\\ 9&x \end{array}\implies \cfrac{6}{9}=\cfrac{10}{x}`

solve for "x"