## A story book, Xiao AI read 1 / 2 of the first day, read 16 pages the next day, and 17 pages did not read. How many pages are there in this story book? (solved by equation) In the fraction of 9 + X / 20 (x is a natural number), when x (), the value of the fraction is equal to 1; When x (), the value of fraction is less than 1; When x (), the value of fraction is greater than 1

1. Suppose the story book has x pages

1x/2+16+17=x

0.5x=33

x=66

The story book has 66 pages

2. In the fraction of 9 + X / 20 (x is a natural number), when x (11), the value of the fraction is equal to 1;

When x (less than 11), the value of fraction is less than 1; when x (more than 11), the value of fraction is greater than 1

This is the first answer. I wish you progress!

Xiao Ming finished reading a literature and art book in three days. On the first day, he read 7 / 10 of the whole book. On the second day, he read the remaining 2 / 3. On the third day, he read 24 pages. How many pages are there in this book

Two solutions, thank you, 0w0

24/（1-7/10）/（1-2/3）

=24 divided by 3 / 10 divided by 1 / 3

=240 (page)

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