In a chemistry lab you need to mix two acid solutions. The first one is 10% acid and the
second is 40% acid. How much of each solution should be mixed to obtain 400 cm3 of a 30% acid solution?
x=liters of 20% alcohol solution to be mixed with 60 liters of 90% alcohol solution. ans: 80 liters of a 20% alcohol solution must be mixed with 60 L of a 90% alcohol solution to get a 50% alcohol solution.
