Journal #89

Begin with an unmarked tub that contains a little more than 17 gallons of water

You have a three gallon and a five gallon measuring device. Without losing any water, measure out four gallons and twelve gallons into two separate unmarked tubs

You cannot retrieve water from the unmarked tubs once you have added it.

Fill the five gallon tub all of the way, then dump it in  the three gallon so you have two gallons in the five gallon tub. repeat to get two gallons. there should then be 14 gallons left in the tub.