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Пошаговое объяснение:
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Кол-во Кол-во ёмкостей Всего
вмещаемой воды
малые 5 л/шт 3 шт 5*3=15
большие 10 л/шт 2 шт 10*2=20
всего ?
Решение
5*3=15 Вода в малых ёмкостях
10*2=20 Вода в больших ёмкостях
15+20= 35 Всего нужно воды
ответ 35
Лена=у
Наташа=z
x+z+y=8
z=8-(x+y)
z=8-5
4/25 z=2,21/25
x+y=5,4/25
x=8-(z+y)
x=2,9/20
x+z=5,11/20
y=5
11/20-z
y=5
11/20-221/25
y=2,71100