Question 703184
The description and question make no physical sense, but here is the arithmetic:


d for 40% solution, u for 60% solution.
{{{(.4*d+.6*u)/(10)=.56}}}
{{{40*d+60*u=560}}}
{{{4*d+6*u=56}}}
{{{2*d+3*u=28}}}


Want to have 10 fluid ounce, so {{{d+u=10}}}.  If multiply both sides of this one by 2, we get equivalent equation, {{{2d+2u=20}}}.


If we now subtract {{{2d+2u=20}}} from {{{2*d+3*u=28}}}, we get u = 8 fluid ounces.  value for d can be easily computed.