Unit 7 · Data and Percentage
School Library — Fiction Readers + Audiobook Fans
Lesson 3 of 3
About this lesson
Now for the most demanding variant in this unit — a multi-layer calculation where you must work through five separate steps before reaching the final answer. One wrong step early on cascades into an incorrect total at the end.
Chapters
Question
A school library recorded checkouts for 3,600 students across four year groups.
- Year 3 had 800 students, and 400 of them checked out a book.
- Year 4 had 1,000 students, and 3 out of every 5 checked out a book.
- Year 5 had 600 students, and 1 out of every 4 checked out a book.
- Year 6 had the remaining students, and 7 out of every 8 checked out a book.
If 50% of students who checked out a book preferred fiction and 40% of students who did NOT check out a book preferred audiobooks, how many students were in these two categories combined?
How many students were in these two categories combined?
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