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A manufacturer has 600 litres of a 12% s...

A manufacturer has 600 litres of a 12% solution of acid. How many litres of a 30% acid solution must be added to it so that acid content in the resulting mixture will be more than 15% but less than 18%?

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The correct Answer is:
the number of litres of the 30% solution of acid will have to be more than 120 litres but less than 300 litres.
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