The answer is 20, since it’s heads and tails you have a half and half chance, therefore you divide 40 in half and get 20
well we know that we have 80mL and we also know that those 80mL will represent the "solute" or the 40% of the Tennessee whiskey total which we can say is 100%, so if 80 is the 40%, how much will it be for the 100% in mL?
Up and down up and down up and down