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

A manufacture have 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 wil be more than 15 % but less than 18 % ?

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.

The amount of solute (mol. Mass=60) that must be added to 180 g of water so that the vapour pressure of water is lowered by 10% is

1300 children took the NuMATS test and 65 % of them scored more than 25 . How many are they?

Acid and water mixed in the ratio 3: 2 to make a 100 litre mixture. How many litres of acid should be added to change theratio to 3: 1 ?