A farmer has 100 gallons of a solution that is 70% disinfectant. He wishes to mix it with a solution that is 90% disinfectant to make a 75% disinfectant solution. How much of the 90% disinfectant solution

A farmer has 100 gallons of a solution that is 70% disinfectant. He wishes to mix it with a solution that is 90% disinfectant to make a 75% disinfectant solution. How much of the 90% disinfectant solution must he use?

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A farmer has 100 gallons of a solution that is 70% disinfectant. He wishes to mix it with a solution that is 90% disinfectant to make a 75% disinfectant solution. How much of th…

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