Предмет: Математика, автор: vipuu

При изготовлении бутылочного стекла на 25 частей песка идёт 9 частей соды,а извести берётся на 4 части меньше чем соды.Сколько надо взять песка если извести и соды взято 700 центнеров?


Автор ответа: перр

9-4=5 (частей извести)

9+5=14 (сумма частей соды и извести)

25:14=1.78571429 (соотношение частей песка к сумме частей соды и извести)

700*1.78571429=1250 (почему 700 надо умножить на 1.78571429. а не разделить или вычесть? ОТВЕТ: потому что 25 больше 14 в 1.78571429 раз. Следовательно 700 кг на умножить на 1.78571429.

Получаем: надо взять 1250 кг песка для изготовления бутылочного стекла.




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