Предмет: Математика, автор: Анюта5647

срочно помогите!!!!!!!

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Автор ответа: piypiy29

140 : 7 * 3 = 60 потрачено на первую книгу
140 - 60=80 это остаток от первой книги
80 : 4 * 3 = 60 потрачено на вторую книгу
140 - 60 - 60 = 20
ответ: осталось 20 чистых листов

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