Question 1122296
x, volume of 36% acid
224-x, volume of 8% acid


This equation is to account for the amount of pure 100% acid:  {{{36x+8(224-x)=10*224}}}


If divide both sides by 4, 
{{{9x+2(224-x)=10*56}}}


Simplify and solve for x.
{{{9x+448-2x=560}}}
{{{7x=560-448}}}
{{{7x=112}}}
{{{x=16}}}---------volume of the 36% acid to use


{{{208}}}----------volume of the 8% acid to use


(the results should be rechecked)