exam
Maths Puzzle
Numerical Ability
A radiator contains 6 liters of a 25% antifreeze solution. How much should be drained and replaced with pure antifreeze to produce a 33% antifreeze solution?
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exam Other Question
how many liters of a 40% alcohol solution must be mixed with a 65% solution to obtain 20 liters of a 50% solution?
(x*x*x*x -81) / ( x -3)