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Question:

A paint company mixes its paint with water to create more paint per gallon. They currently have ten-gallon jugs which contain 10% water. How much water must they add to create an 80/20 mix of paint to water?

A 1.25 gallons
Explaination

Currently the mixture is 90% paint, 10% water or 9 gallons of paint for every 1 gallon of water.
For the company to create an 80% / 20% mix, the company must add 1.25 gallons to their current 10 gallon mixtures. This will create 2.25 gallons of water for every 11.25 total gallons. This results in a 2.25/11.25 or 20% water mix.