How may litres of water will have to be added to 1125 litres of the `45 %` solution of acid so that the resulting mixture will contain more than `25 %` but less than 30% acid content?

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%?

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

How many litres of water must be added to 1 litre of an aqueous solution of an acid having pH 4.70 to create an aqueous solution having pH 5.70?

How many liters of a 25% saline solution must be added to 3 liters of a 10% saline solution to obtain a 15% saline solution?

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 there are 640 litres of the 8% solution, how many litres of 2% solution will have to be added?

Solution of 9% acid is to be diluted by adding 3% acid solution to it. The resulting mixture is to be more than 5% but less than 7% acid, If there is 460 L of the 9% solution, how many litres of 3% solution will have to be added

How many grams of glucose be dissolved to make one litre solution of 10% glucose:

How many grams of glucose be dissolved to make one litre solution of 10%1 glucose:

How many times a fair coin must be tossed, so that the probabillity of getting at least one tail is more than 90 %

How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%?