Question 300712
A - Liters of 60% solution
B - Liters of 80% solution
Total volume equation:
1.{{{A+B=20}}}
.
.
Total concentration equation:
{{{60A+80B=65(20)}}}
{{{60A+80B=1300}}}
2.{{{3A+4B=65}}}
From eq. 1,
{{{A=20-B}}}
Substitute into eq. 2,
{{{3(20-B)+4B=65}}}
{{{60-3B+4B=65}}}
{{{B=5}}}
Then from eq. 1,
{{{A=20-B}}}
{{{A=20-5}}}
{{{A=15}}}
Use 15 liters of 60% solution and 5 liters of 80% solution