book Maths Puzzle Numerical Ability

Solution A is 12% acid and Solution B is 4% acid. If a technician wants to mix them to make 60 liters of Solution C which is 10% acid, how many liters of each should be mixed toget

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book Other Question
how many liters of water must be added to 8 liters of a 40 percent acid solution to obtain a 10 percent acid solution? [(k-7)/5]+2=(k-8)/10