Precautions question

Question

Ten liters of 30% acid solution is obtained by mixing a 20% solution with a 50% solution. Provide the set-up. You do NOT have to solve the system.

Answer 1

Ten liters of 30% acid is 3 liters of 100% acid.

3 = .20x + .50x, solve for x and then substitute that value back into the equation to determine the amount of each acid.