Solve the problem.
-It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 40 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired
Strength?
A) 20 L
B) 10 L
C) 16 L
D) 13.3 L

Question

Quizplus · Accepted Answer

To achieve a 40% antifreeze solution, we need to replace some of the 20% solution with 100% antifreeze. Let x be the amount to drain and replace. The equation is: (40 - x)(0.2) + x = 40(0.4). Solving gives x = 10 L.

Solve the Problem. -It Is Necessary to Have a 40% Antifreeze Solution in Antifreeze