exam Maths Puzzle Numerical Ability

How many liters of water must be added to 8 liters of a 40% acid solution to obtain a 10% acid solution

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exam Other Question
Simplify ((9x^4-72X)/(3x^2-12))*((x^2+x-2)/(4x^3+8x^2+16x)) find the value of {4+5}x{6-3}