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The sixth grade teacher teaches 26 pages of answers (doing equations) in every class.
I have read two fifths of this book.

The rest is: 1-2/5=3/5.

Suppose this book has x pages.

According to the meaning of the question:

x-2/5*x=555

3/5*x=555

x=925

A: This book has 925 pages.

Note: * is the symbol of multiplication/division.

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