Предмет: Математика, автор: insusskanya

когда турист проехал 65% намеченного пути ему осталось проехать еще 140км Какова длина намеченного туристом пути помогите пожалуйста

Ответы

Автор ответа: kolobok19702009

Пусть х - 65% пути
Тогда х+140 - 100% пути
составим пропорцию и решим уравнение
65:х=100:(х+45)
100х=65х+9100
100х-65х=9100
35х=9100
х=9100:35
х=260

260+140=400 км весь путь

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