Question 1012272
x, how much 5% acid
1, the one unit for the completed solution;
1-x, how much 30% acid


{{{5x+30(1-x)=1*10}}}
{{{5x+30-30x=10}}}
{{{-25x+30=10}}}
{{{-25x=-20}}}
{{{x=20/25}}}
{{{x=4/5}}}---------------{{{1-x=5/5-4/5=1/5}}}


Ratio of the 30% to the 5% acids is 1:4.