Предмет: Математика, автор: sgrincisin0

Дівчинка прочитала 20 сторінок, що становить 0,4 усієї книжки.Скільки сторінок у книжці?

Ответы

Автор ответа: taraskyshkar

Ответ: 50 сторінок

Пошаговое объяснение:

20ст - 40% книжки

20+20 =40 сторінок (80% процентів книжки)

І половина від 40% книжки 40:2 =20% (10 сторінок) 40+10=50ст

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