Предмет: Математика, автор: rsaykhanov9505

В группе 40 туристов.Из них 20 говорят на английском, 15 на французском, 11 по испански.Английский и французский - 7 человек, английский и испанский -5 человек, французский и испанский - 3 человека.Два туриста говорят на 3-х языках. Сколько человек из группы не знает ни одного языка?
отдам все балы!

Ответы

Автор ответа: klimkatek
7

Ответ:

11 человек.

Пошаговое объяснение:

вычитать будем при объединении. при вычитании вычеркиваем допустим что человек с навыком языка это .

рисуем такую схему:

а.   ....................(20)

ф. ...............(15)

и.  ..........(11)

11-5-3-2=1   говорят только по испански

15-7=8(с теми кто говорит на испанском, и теми кто говорит на всех языках уже объединили)

теперь

40-(1+8+20)=11 человек не говорят н и на одном из представленных языках

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