Problem 10 · Find and add gaps to a common total · 3 points
Made by AI and not reviewed by a real person.
If the four friends keep reading until they have all read the same number of books, what is the fewest extra books they must read altogether?
- 7
- 3
- 8
- 4
- 1
Show a hint
- No one can unread a book. Which bar sets the lowest possible finish line for everyone?
- Find how far each shorter bar is from that finish line, then add the gaps.
Show the answer and solution
Answer: C — 8
Ben has read the most, so the smallest possible equal total is 7 books each. Amy needs 3 more, Cleo needs 4 more, and Dan needs 1 more. Together they need 3 + 4 + 1 = 8 extra books. The choice 4 counts only Cleo’s books, not everyone’s.