How many milliliters of a(n) 30% acid solution should we add to a(n) 60% acid solution to get 5,000 milliliters of a(n) 45.6% solution?

Solution:

X milliliters of a(n) 30% acid solution should be added

So

x*30%+60%*(5000-x)=5000*45.6%

x=2400

So 2400 milliliters of a(n) 30% acid solution should be added