Предмет: Математика, автор: elenakoeva1959

З 21кг залізної руди добули 7 кг заліза.скільки кілограмів заліза можна добути з 54кг такої руди?

Ответы

Автор ответа: Аноним

321 кг руды - 7 кг железа
54 кг руды - х кг железа
х = 54·7: 321 = 126/107(кг) = 1 19/107 (кг)

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