Question

A person preparing medicine wants to convert 15% of alcohol solution into 32% of alcohol solution. Find how much pure alcohol should be mix with 400ml of 15% alcohol solution to obtain it.

Answer 1

see...in 400 ml of alcoholic solution, percent of alcohol is 15%
so, volume of alcohol= 15% of 400 ml
                                  =60 ml
now, 15% is 60 ml, so 1% = 60/15= 4 ml
so , 32 % = 32×4 = 128 ml
volume added= 128 - 60 = 68 ml

hope this  explaination makes u understand :)