Предмет: Математика, автор: liza290520027

У миши и коли в коллекциях было одинаковое число марок.Когда миша подарил часть своих марок младшему брату,а коля в 1,4 раза меньшее число своих марок отдал на выставку у миши осталось 20марок а у коли 40.Сколько марок было у каждого мальчика первоначально,сколько марок коли на выставке и сколько марок миша подарил брату

Ответы

Автор ответа: математик2011

122

Пусть Миша подарил брату - х марок, тогда Коля отдал на выставку х:1,4
Получаем уравнение
20 + х = 40 + (х/1,4)
20+х=(56+х)/1,4
28=1,4х=56+х
0,4х=28
х=70
Ответ: первоначально у мальчиков было 90 марок, Миша подарил брату - 70 марок, а Коля отдал на выставку - 50 марок

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