After running 25% of a race, Giselle had run 50 metres. How long was the race, in metres?
(A) 100 (B) 1250 (C) 200 (D) 12.5 (E) 400
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.