Question

The formula for glue says to at 50ML of a hardener to each container of resin how much hardener should be added to 19 containers of resin

Answer 1

`\bf \begin{array}{ccll} \stackrel{mL}{hardener}&\stackrel{resin}{container}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 50&1\\ x&19 \end{array}\implies \cfrac{50}{x}=\cfrac{1}{19}\implies \cfrac{50\cdot 19}{1}=x\implies \stackrel{mL}{950}=x \\\\\\ \textit{now, there are 1000 mL in 1 liter, so }950~\underline{mL}\cdot \cfrac{L}{1000~\underline{mL}} \\\\\\ \cfrac{950}{1000}L\implies 0.95~L`