Fertilizer
Mr. Gherkin uses for fertilization 7% solution of fertilizer. 9 liters of it still left.
How much water must be added to the solution to make only the 4% solution?
How much water must be added to the solution to make only the 4% solution?
Correct answer:

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algebraarithmeticbasic operations and conceptsUnits of physical quantitiesthemes, topicsGrade of the word problem
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