How to do the last question on page 27 of Shanghai sixth grade math workbook, a textbook for nine-year compulsory education?
Textbook for Nine-year Compulsory Education: The last question on page 27 of Shanghai Sixth Grade Math Workbook: Multiply 30% of the first day by (1+50%) to calculate 45% of the next day, and then divide the remaining 50 pages by (1-30%-45%)= the total number of pages is 200.