Предмет: Математика, автор: valiychka

Срочно! Помогите решитьизадачу 10

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Автор ответа: uchilka2012

0

8/8-5/8=3/8 - это 24 страницы
24/3=8 страниц - это 1/8
8*5=40 страниц - во 2 день
40+24=64 страницы - во 2 и 3 дни
100%-20% =80% - это 64 страницы
64 стр - 80 %
? стр - 20%
64*20/80=16 страниц - в 1 день
64+16=80 страниц в книге

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