Solve the Problem. -In a Chemistry Class, 7 Liters of a 4% Silver

Multiple Choice

Solve the problem.
-In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?

A) 2.5 L
B) 4.5 L
C) 7.0 L
D) 3.5 L