To clean a tank, 3/4 cup of disinfectant is needed for 4 gallons of water. How many cups are needed for 20 gallons of water?

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This math question can be solved by figuring out the relation between the increase in the volume of gallons of water in the tank and the increase in volume of disinfectant. To figure this out, one must understand how much of an increase there is in rate between 4 gallons of water and 20 gallons of water. 20 gallons...

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