book Maths Puzzle Numerical Ability

A car radiator holds 24 L of a 20% antifreeze solution. How much of the 20% solution should be drained and be replaced with pure antifreeze to give a 40% antifreeze solution?

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using the power series for e^x, determine the value of 6e^0.6 correct to five significant figures A machine that originally cost $15,600 has a value of $7500at the end of 3 years. The same machine has a value of $2800 at the end of 8 years.

a.) Find the average rate of chang