Word Problems With Fractional Coefficients: Problem 1

Problem: Bertha is reading a book. The first day, she reads 30 pages more than 1/8 of the book. On the second day, she reads 4 pages less than 1/6 of the book. She still has 3/5 of the book left to read. How many pages in total is this book?

Key: What is the variable? Where is the equivalence?

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