Puzzle: Five clerks (Ana, Ben, Cara, Dan and Eli) sit at desks numbered 1 to 5 from left to right. Cara sits at desk 3. Eli sits immediately to the left of Ana. Ben sits somewhere to the left of Dan. Dan does not sit at desk 5. Who sits at desk 1?
Correct answer: C. Ben
If Eli and Ana were at desks 1 and 2, Ben and Dan would take desks 4 and 5, forcing Dan to desk 5, which is not allowed. So Eli and Ana are at 4 and 5, and Ben and Dan at 1 and 2. The only arrangement is: desk 1 Ben, desk 2 Dan, desk 3 Cara, desk 4 Eli, desk 5 Ana.
hard