Question 371916

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Let A be the amount of 5% solution, B the amount of 7% solution.
1.{{{A+B=2}}}
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{{{5A+7B=6.1(2)}}}
2.{{{5A+7B=12.2}}}
Multiply eq. 1 by (-5) and add to eq. 2,
{{{-5A-5B+5A+7B=-10+12.2}}}
{{{2B=2.2}}}
{{{highlight(B=1.1)}}}liters
Then from eq. 1,
{{{A+1.1=2}}}
{{{highlight(A=0.9)}}}liters