Предмет: Математика, автор: vatsindronknopaa

Скільки літрів води треба додати до 1 л 9% розчину оцту, щоб отримати 3% розчин оцту?

Ответы

Автор ответа: 555ai555
0

Ответ:

Пошаговое объяснение:

найдем объем уксуса в 9% растворе

1*0.09 = 0.09 литров

тогда воды в нем

1-0.09 = 0.91 л

общий объем 3% раствора

0.09/0.03 = 3 литра

Воды в нем

3-0.09 = 2.91

долили воды

2.91 - 0,91 =2 литра

Автор ответа: iramazurk
0

Ответ:

2 литра

Пошаговое объяснение:

9% = 9 : 100 = 0,09

3% = 3 : 100 = 0,03

3% раствор = х

х * 0,03 = 0,09

х = 0,09 : 0,03

х = 3

3 - 1 = 2 литра воды нужно добавить

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