Question 791400
{{{x}}}= volume of the container
{{{"20%"=20/100=0.2}}}
20% of x ={{{0.2x}}}
{{{0.2x=100mL}}}
Multiplying both sides times 5
(or dividing both sides by 0.2; it's the same thing)
we get
{{{x=highlight(500mL)}}}