exam Maths Puzzle Numerical Ability

It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 70 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?

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whithout using a calculator, for each number in the form log x, find some integers a and b such that a<log x <b. Justify your answer. Then verify your answers with a calculator. Subject: Ratios and areas of similarFigures Question: The ratio of the areas of two parallelograms is 9 to 25. The lenght of the shorter side of the larger parallelogram is 40