Solve the problem.
-In a chemistry class, 5 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) $1.5 \mathrm{~L}$
B) $5.0 \mathrm{~L}$
C) $2.5 \mathrm{~L}$
D) $3.5 \mathrm{~L}$

Question

Quizplus · Accepted Answer

To solve, let $ x $ be the liters of the $10 \%$ solution. The equation is $ 0.04(5) + 0.10(x) = 0.06(5 + x) $. Solving gives $ x = 2.5 $ liters.

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