A solution contains 30 mL of ethyl alcohol mixed with 100 mL of water. The concentration of the solution in terms of volume by volume percentage is ___ %.
A solution contains 5.6 ml of alcohol mixed with 75 ml of water. Calculate the concentration of this solution.
A solution contains 40 mL of ethyl alcohol mixed with 100mL of water. What is the concentration of the solution in terms of volume by volume percentage?