Question 368329
Let A be the amount of 11% acidic solution, B the amount of 6% acidic solution  
1.{{{A+B=600}}}
{{{11A+6B=8(600)}}}
2.{{{11A+6B=4800}}}
Multiply eq. 1 by (-6) and add to eq. 2,
{{{-6A-6B+11A+6B=-3600+4800}}}
{{{5A=1200}}}
{{{highlight(A=240)}}}ml
Then from eq. 1,
{{{240+B=600}}}
{{{highlight(B=360)}}}ml