Solve the problem.
-The radiator in a certain make of car needs to contain 40 liters of 40% antifreeze. The radiator now contains40 liters of 20% antifreeze. How many liters of this solution must be drained and replaced with 100%antifreeze to get the desired strength?
A)10.0 L
B)16 L
C)20L
D)13.3 L

Question

Quizplus · Accepted Answer

Let x be the number of liters of 20% antifreeze that must be drained and replaced with 100% antifreeze.The amount of antifreeze in the original solution is 0.20 * 40 = 8 liters.The amount of antifreeze in the new solution will be 0.40 * 40 = 16 liters.Therefore, the amount of antifreeze that must be added is 16 - 8 = 8 liters.Since the new solution will be 100% antifreeze, the amount of 20% antifreeze that must be drained is x = 8 liters.

Solve the Problem. -The Radiator in a Certain Make of Car Needs to Car