The paint company currently has 10-gallon jugs which contain 10% water. This means that each jug has 9 gallons of paint and 1 gallon of water.
To create an 80/20 mix, the jugs need to have 2 gallons of water for every 8 gallons of paint. This means that the company needs to add 1 gallon of water to each ten-gallon jug.
However, the jugs already contain 1 gallon of water. Therefore, the company needs to add an additional 1.25 gallons of water to each jug to achieve the desired mix.