Предмет: Алгебра, автор: azizatursunbaeva5

Аня,Боря,Вика и Гена дежурят в течении 20 дней в школе.Известно,что каждый день дежурят ровно трое из них.Аня дежурила 15 раз,Боря-14 раз,Вика-18 раз.Сколько раз дежурил Ге

Ответы

Автор ответа: Удачник66

Ответ:

13 раз

Объяснение:

Они дежурят в течение 20 дней, и каждый день по трое.

Всего 20*3 = 60 человеко-дней. Есть такой параметр при оценке количества труда несколькими работниками.

Значит, Гена дежурил 60 - 15 - 14 - 18 = 13 раз

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