How much pure alcohol be added to 400 ml of a 15% solution to make its strength 32%?

How much pure alcohol be added to 400mlofa15% solution to make its strength 32%?

How much pure alcohol has to be added to 400 mL of a solution containing 15% of alcohol to change the concentration of alcohol in the mixture to 32%?

20 mL of a solution of sulphuric acid neutrlise 21.2 mL of 30 % solution of sodium carbonate. How much water should be added to 100 mL of this solution to bring down its strength to decinormal ?

20 mL of a solution of H_2SO_4 neutralises 21.2 mL of 30% solution (w/v) of Na_2CO_3 . How much water should be added to each 100 mL of the solution to bring down its strength to decinormal ?

20 mL of a solution os sulphuric acid neuitralise 21.2 mL of 30% soution of sodium carbonete. How much water should be added to 100 mL of this solutio to bring down its down its strength to decinoral?

A 50 litre mixture of water and alcohol contains 10% alcohol. How much more alcohol must be added to make the strength of alcohol 40% in the new mixture? (a)25 (b)30 (c)20 (d)23