Thirty Liters of a 40% Acid Solution Is Obtained $\left\{ \begin{array} { l } x + y = 30 \\0.28 x + 0.43 y = 12\end{array} \right.$

question 272

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

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