exam Maths Puzzle Numerical Ability

how much antifreeze must be added to 12L of 40% solution of antifreeze to obtain a 60% solution?

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A broker invested some money at 7.5% interest,and a thousand dollars less at 6% annual interest. After one year she earned $1087.50 in interest. How much money was invested at each 6(x-1)not equal to 18 this has to be solved for x