Предмет: Математика, автор: aminariana14

В классе 45 ученика, контрольную по математике на оценку 4 написали 20%,на оценку 5 1/15, на оценку 2 написали 0,4 учащихся класса.Сколько учеников написали контролную на оценку 3?

Ответы

Автор ответа: iosiffinikov

0

Ответ:

15 учеников

Пошаговое объяснение:

На 5 написали 45/15=3 ученика

На 4 45/5=9 учеников

На 2 написали 45*4/10=45*2/5=18 учеников

на 3 написали 45-18-9-3=15 учеников

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