exam Maths Puzzle Numerical Ability

How many litrs of 20% alcohol solution must be mixed with a 60% solution to obtain 40 litres of a 35% solution?

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exam Other Question

what is the volume and the surface area of a combined figure of a phramid and square/rectangular prism? mary invests $24,000 in two seperate accounts. one earns 6% simple interest and the other 9%. if she earned a total of $1740, how much did she invest at each rte?