Question 1189870
"solutions"?  No. Not solutions in water.  MIXTURE, then this is not a liquid.  This would be mixture of powders or granules.  
For the "ounces", this may be okay, as long as "fluid ounces" is NOT intended.


The mathematics you are looking for can be like this:


g,  how much of the 70%
60-g, how much of the 40%


{{{70g+40(60-g)=60*60}}}------Solve this but save all computations for last.