Question

Tom is making a punch that contains 80% cranberry juice and the rest ginger ale. The has two liters of ginger ale.

Answer 1

$\sf Let \:the\: volume\: of \:punch\: be \:x \\\\\sfAnd \:volume\: of \:ginger\: ale \\\\\sf2=x-(80\% of x) \\\\\sf2=x-\frac{4x}{5} \\\\\sf2=\frac{5x-4x}{5} \\\\\sf2=\frac{x}{5} \\\\\sfx=10 litres \\\\\sfVolume \:of \:cranberry\: juice\:= \frac{4x}{5} \\\\\sf=\frac{40}{5}=8 litre$