exam Maths Puzzle Numerical Ability

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|3x+4|< 13

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A solution containing 30% insecticide is to be mixed with a solution containing 50% insecticide to make 200 L of a solutions containing 42% insecticide. How much of each solution should be used? a water tank in the shape of a cone holds 100 cubic feet of water and has a diameter of 6 feet. estimate its height