Adults are stumped by a simple question!

This problem has over 40,000 likes on Reddit and is being covered by many websites. Klein read 30 pages of a book on Monday and 1/8 of the book on Tuesday. He completed the remaining 1/4 of the book on Wednesday. How many pages are there in the book?

Sources

A test problem on my 5th grade brothers’ math exam.
byu/springwaterh20 inmildlyinteresting

https://www.news.com.au/lifestyle/real-life/news-life/year-5-students-exam-question-has-left-adults-stumped/news-story/b0371af55915dc38744f30accbb59daa
https://www.ladbible.com/community/10-year-old-maths-exam-question-adults-reddit-995655-20230220
https://www.dailystar.co.uk/real-life/year-5-maths-question-stumps-29262435
https://www.dailymail.co.uk/news/article-11753951/Tricky-math-exam-question-aimed-10-year-olds-stumps-internet.html

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