Предмет: Математика, автор: Drylmayor

Сплав состоит из меди и цинка. Медь и цинк содержатся в нем в отношении 3:7. Взяли кусок сплава массой 7 килограммов. Сколько килограммов меди в этом куске?

Ответы

Автор ответа: olena8565

Ответ:

3x -ето медь

7x-ето цинк

3x+7x=7

10x=7

x=0,7

3×0.7=2.1

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