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
Find two consecutive integers whose product is 15 less than the square of the smaller number. If angle ABC is congruent to angle XYZ, list th 6 congruent pairs.