Question 33157
Let the solution be x for 30%
Let y=40-x be the solution for 80%
Equation:
30x+80(40-x)=70(40)
30x-80x=70(40)-80(40)
-40x=-400
x=10
40-10=30
Hence, about 10 ounces is needed for 30% and 30 ounces is needed ofr 80%.
Paul.