Question 157679
Adding x ml of 70% solution, the balance equation becomes,
{{{50(320+x)=30(320)+70(x)}}}
Solve for x.
{{{50(320+x)=30(320)+70(x)}}}
{{{16000+50x=9600+70x}}}
{{{-20x=-6400}}}
{{{x=320}}}
Add 320 ml of 70% solution.