Предмет: Математика, автор: 70rus355

Артем в первую неделю прочитал 40% всех книг, во вторую он прочитал 58% оставшихся страниц, а в третий последние 126 страниц. Сколько всего книг было в книге?
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Ответы

Автор ответа: isom
0

Ответ:

100% - 40% = 60% осталось прочитать после первой недели

во вторую  неделю 58% от оставшихся страниц (60%)

0,58*0,6 = 0,348

0,348*100% = 34,8%  от всех страниц

100% - (40% + 34,8%) = 25,2% или 126 страниц

100%   -  х

25,2%  - 126

х = (126*100)/25,2 = 500 страниц

Пошаговое объяснение:

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