Ответ учителя по предмету Математика
20*2=40 (сеток) рабочий раскладывал за 2 часа
15*3=45 (сеток) рабочий раскладывал за 3 часа
40+45=85 (сеток) всего раскладывал
85:5=17 (сеток) средняя производительность
17*8=136 (сеток) картофеля рабочий уложит за восьмичасовой рабочий день.
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