exam Maths Puzzle Numerical Ability

A homeowner wishes to insulate her attic with fiber glass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the att

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How much of a liquid with a 30% alchohol content and how much of a liquid with a 100% alcohol content should be added to end up with 42 milliiters of with a 50% alcohol content? [1/(a5b)]-[5/(ab3)]