exam Maths Puzzle Numerical Ability

A car radiator has a 6 liter capacity. If the liquid in the radiator is 40% antifreeze, how much liquid must be replaced with pure antifreeze to bring the mixture up to a 50% solu

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the length of a rectangular field is 10 meters less than four times its width. it cost $1584 to put a fence around the field. If the fencing cost 4.80 per meter what is the area of the field? can u please help me with this storyproblem

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