Предмет: Математика, автор: Rocker6

ДАЮ 50 БАЛОВ ТО РЕШИТ ПРАВИЛЬНО!НЕ ВРУ!ЧЕСТНО!В классе 20 учеников, КОнтрольную работу по матетеше 20% учеников написали на "5",50% учеников-на "4".Сколько учеников класса написали контрошу на 5 и 4?

Ответы

Автор ответа: olesya1205

20=100%
------------
Х=70%
50%+20%=70%

Х=20•70:100=14уч
Это70%

Автор ответа: Rocker6

по коректнее объясни!

Автор ответа: fgilmullin

20:100*20=4 ученика на 5
20:2=10 учеников на 4
10+4=14 учеников написало на 4 и 5

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