Question 368875
Let A be the amount of 30% solution, B the amount of 60% solution.
1.{{{A+B=120}}}
.
.
{{{30A+60B=40(120)}}}
2.{{{A+2B=160}}}
Subtract eq. 1 from eq. 2,
{{{A+2B-A-B=160-120}}}
{{{highlight(B=40)}}}liters
.
.
From eq. 1,
{{{A+40=120}}}
{{{highlight(A=80)}}}liters