Amy mixes 12 liters of 16% acid solution with a 40% acid solution, which results in 32% acid solution.
Let x represent the number of liters of 40% solution used and let y represent the number of liters of mixture. Which system of equations can be used to find the number of liters of 40% acid solution in the mixture?
x+12=y - number of liters when solutions are mixed 0.4x - amount of acid in 40% solution 12 *0.16=1.92 - amount of acid in 12 L of 16% solution 0.4x+1.92 - amount of acid when solution are mixed 0.32y - amount of acid that we want to get , is the same as amount of acid when solutions are mixed, so second equation is 0.32y=0.4x+1.92, so correct answer is last one D
