exam Maths Puzzle Numerical Ability

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.

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exam Other Question

Solve y-3/x+2=-1/5 for y 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?