exam Maths Puzzle Numerical Ability

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p^-3/4m^2 (2p^2/m^-2 - 8m^-2/a^2b^3p)

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exam Other Question

a tank holds 80 liters of a chemical solution. currently, the solution has a strenght of 30%. how much of this solution must be drained and replaced with a 70% solution to get a strenght of 40%? Factor completely.

z squared + 2z - 8