Xiao Hong read a story book. She read 20 pages on the first day, 30 pages on the second day, and 5 / 8 of the book in two days. How many pages are there in this book?
This is a very simple question. First of all, I read 5 / 8 of the whole book in two days. I read 50 in two days. Then the whole book is 50 / (5 / 8)
The result was 80
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