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A solution of 8% boric acid is to be dil...

A solution of 8% boric acid is to be diluted by adding a 2% boric acid solution to it. The resulting mixture is to be more than 4% but less than 6% boric acid. If we have 640 litres of the 8% solution, how many litres of the 2% solution will have to be added?

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The correct Answer is:
More than 320 litres but less than 1280 litres.
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