Problema Solution
Mara needs to mix some 30% acid solution and some 70% alcohol solution to end up with 20 liters of 54% solution. How many liters of the 70% solution will she need?
Answer provided by our tutors
Let
x = liters of the 70% solution
20 - x = liters of the 30%
0.30*(20 - x) + 0.70x = 0.54*20
........
click here to see the equation solved for x
........
x = 12 L
Mara needs 12 liters of the 70% solution.