If you have a 1 liter 70% rubbing alcohol, how much (in volume) alcohol is present?

Question

im quite confused can someone help me to answer this

Answer 1

Let's assume the 70% is by volume, i.e. 70% v/v. This means, by definition, 70 ml alcohol per 100 ml solution.

70 ml alcohol/100 ml soln x 1000 ml soln = 700 ml alcohol