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

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A solution of 10% boric acid is to be diluted by adding a 4% boric acid solution to it. The resulting mixture is to be more than 5% but less than 8% boric acid. If we have 750 litres of the 10% solution, then the quantity of the 4% solution that has to be added will lie between

A manufacturer has 640 litres of a 8% solution of boric acid. How many litres of a 2% boric add solution be added to it so that the boric acid content in the resulting mixture will be more than 4% but less than 6%?

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