Mathematics, 04.05.2020 23:00, mya2019

If a scientist mixed 20% saline solution with 70% saline solution to get 10 gallons of 30% saline solution, how many gallons of 20% and 70% solutions were mixed?

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If a scientist mixed 20% saline solution with 70% saline solution to get 10 gallons of 30% saline so...