Problema Solution
The cooling system of a certain foreign-made car has a 15 liter capacity. If the system is filled with a mixture that is 40% antifreeze, how much of this mixture should be drained and replaced with pure antifreeze to obtain a solution that is 60% antifreeze.
Answer provided by our tutors
let
x = liters to be drained and replaced with pure 100% antifreeze
0.40(15 - x) + 1*x = 0.60*15
by solving we find
x = 5 l
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5 liters of the 40% antifreeze should be drained and replaced with pure antifreeze.