Question 260701
x-Amount of 75% solution
y-Amount of 25% solution
1.{{{x+y=500}}}
2.{{{75x+25y=40(500)=2000}}}
From eq. 1,
{{{x=500-y}}}
Substitute into eq. 2,
{{{75x+25y=2000}}}
{{{75(500-y)+25y=20000}}}
{{{37500-75y+25y=20000}}}
{{{-50y=-17500}}}
{{{y=350}}}
Then from eq. 1,
{{{x=500-y}}}
{{{x=500-350}}}
{{{x=150}}}
Use 150ml of 75% solution and 350ml of 25% solution.