Question 843683
Volume:
1.{{{A+B=300}}}
Concentration:
{{{15A+45B=25(300)}}}
{{{15A+45B=7500}}}
2.{{{A+3B=500}}}
Subtract eq. 1 from eq. 2,
{{{A+3B-A-B=500-300}}}
{{{2B=200}}}
{{{B=100}}}
and from eq.1,
{{{A+100=300}}}
{{{A=200}}}
200ml of 15% and 100ml of 45%.