Question

A pharmacist needs to strengthen a 15% alcohol solution to oneof 32% alcohol.how much pure alcohol should be added to 800 ml of 15% solution

Answer 1

15% = 800

1 % = 800/15

32% = 800/15 * 32

        = 1706.6 ml

32% - 15% = 1706.6 - 800
                  = 906.6 ml