Thirty​ Liters of a 40% Acid Solution Is Obtained by Mixing

Multiple Choice

Thirty​ liters of a 40% acid solution is obtained by mixing a 28% solution with a 43% solution.How much of each solution is required to obtain the specified concentration of the final mixture? Use this system of linear equations there x and y represents the amounts of the 28% solution and 43% solution. ​​ $$\left\{ \begin{array} { l } x + y = 30 \\0.28 x + 0.43 y = 12\end{array} \right.$$ ​

A) ​28% solution: 6 L;43% solution: 24 L
B) 43% solution: 6 L;28% solution: 24 L​
C) ​28% solution: 40 L;43% solution: 24 L
D) ​43% solution: 40 L;28% solution: 24 L
E) ​43% solution: 7 L;28% solution: 24 L