Solve Using a System of Two Equations in Two Unknowns

Multiple Choice

Solve using a system of two equations in two unknowns.
-Dmitri needs 5 liters of a 7% solution of sulfuric acid for a research project in molecular biology. He has two unlimited supplies of sulfuric acid solution: 5% solution and 10% solution. How many
Liters of each solution should Dmitri use?

A) 5% solution: 3.5 L, 10% solution: 1.5 L
B) 5% solution: 3 L, 10% solution: 2 L
C) 5% solution: 2.5 L, 10% solution: 2.5 L
D) 5% solution: 2 L, 10% solution: 3 L