book Maths Puzzle Numerical Ability

A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100 mL of a 12%-saline solution. How much of the 10%-saline solution did the pharmacist use in the mixture?

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The nurse has 0.56 liters of a solution that is 89.9% alcohol. How much pure alcohol must she addd to bring the solution up to a 95.8% concenration? I cannot translate these proble which are the properties of real numbers?