Предмет: Математика, автор: dddddd7864sjjsjs

Олег за три дні прочитав книгу.За перший день прочитав 38% усієї книги,за другий 42% усієї книги,за третій решту 42 сторінки.Скільки сторінок у книзі.5 клас

Ответы

Автор ответа: vojcenkovlad3

42 + 38 = 80%

100 - 80 = 20

20 = 42

100 = X

100*42/20

210 сторінок у книжці

kluychkabodia: Ні! там сказано, що за перший дееь він прочитав 38% УСІЄЇ КНИГИ, і за другий день 42% ВСІЄЇ КНИГИ. Значит треба віднімати

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