text: ## Prealgebra (7th Edition)
  
  $\frac{8}{5}=\frac{x}{10}$ $\longrightarrow$ cross multiply $5x=8\times10$ $\longrightarrow$ simplify $5x=80$ $\longrightarrow$ divide both sides by 5 $5x\div5=80\div5$ $\longrightarrow$ simplify $x=16$