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Автор - sattorova02

в школе 15 учеников учаться на 5 это состовляет 5% всех учашихся школы сколько всего учашихся в школе

Ответ

Автор - IAliceI
15=5%
х=100%
Отсюда x= 15:3*100=300

Ответ

Автор - mikluxa
составляем пропорцию 
15уч /5% =x/100%
x=300 учеников

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