exam Maths Puzzle Numerical Ability

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

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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? When a positive integer "k" is divided by 6, the remainder is 1. What is the remainder when 5k is divided by 3?
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