Предмет: Математика, автор: Chesscake

Задача с иксом .Два трактора должны вспахать 219га. Первый трактор в день может вспахать 14га, а второй 15га. Через сколько дней после начала работы второго трактора к нему должен присоединиться первый трактор, чтобы вся работа была выполнена за 9 дней?

Ответы

Автор ответа: 7zaek
0
219 / 9 = 24,3333 га нужно вспахать в день
14*9 = 126 га вспашет 1 трактор за 9 дней
219-126 = 93 га останется вспахать 2 трактору
93/15 = 6,2 дня потребуется для того чтобы вспахать оставшуюся часть земли 2 трактору 
9-6,3 = 2,7 дней должен присоединиться. Через 2 дня.

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