book Maths Puzzle Numerical Ability

Help me solve the following equation for the variable x: 4xz=p

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Find and simplify P(a+h)-P(a) given P(x)=x^2-2x It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now holds 20 liters of 20% solution. How many liters of this should be drained and