Problema Solution
the boys bought a car that is filled with 5 L of a 30% antifreeze solution. how many liters must be drawn off and replaced by pure water to obtain a 25% solution that the car's manual says should be in the radiator?
Answer provided by our tutors
Let 'x' represent the liters of the 30% antifreeze solution that needs to be replaced with pure water (0% antifreeze).
0.30(5 - x) + 0*x = 0.25*5
........
click here to see the equation solved for x
........
x = 0.83 L
0.83 liters of the 30% antifreeze should be replaced by pure water.