exam Maths Puzzle Numerical Ability

How many liters of pure water (o% salt) must be added to 5 liters of an 85% salt solution to dilute it so a 68% salt solution?

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exam Other Question

f(x) = 2^3x and g(x) = 8^-x

Explain the reason for the graphical behaviour of the pair of functions above. Subtract. Express your answer in simplest form. 4x/x-3 - 12/x-3