"A 20-gallon alcohol-water solution contains 15% pure alcohol. How much alcohol should be added to make a new solution that is 20% alcohol?"
My calculation:
20 x 15/100 = 3
20 x 20/100 = 4
1-gallon alcohol should be added to make a new solution that is 20% alcohol.
My calculation:
20 x 15/100 = 3
20 x 20/100 = 4
1-gallon alcohol should be added to make a new solution that is 20% alcohol.