Вопрос школьника по предмету Математика
Марат купил книгу на 5/7 имеющихся у него денег , У него осталось 50 тенге. Сколько денег было у Марата первоначально
А.180 тг; В. 175 тг; С.178 тг; D.165тг ;?
Ответ учителя по предмету Математика
Х-5/7х=50
2/7х=50
Х=50/1*7/2
Х=175 было тг всего
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