exam Maths Puzzle Numerical Ability

A 34% acid solution was mixed with a 66% acid solution to produce 216 liters of a 42% acid solution. How much liters of each solution was mixed?

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exam Other Question

How to simplify this?
3/(x^3+3x^2-x-3)-2/(x^3-x^2-3x+3)+4/(x^3+x^2-3x-3)
please help me simplify 36^1/2