If 1+1.1+1.11+□=4.44, what number should be put in the box to make the equation true?
(A) 3.33 (B) 1.23 (C) 0.12 (D) 2.13 (E) 3.21
Want a route through all this instead of an archive? The track
puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.
Source: CEMC, University of Waterloo,
licensed CC-BY-NC-4.0.
Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.