The average of four test marks was 60. The first three marks were 30, 55 and 65. What was the fourth mark?
(A) 40 (B) 55 (C) 60 (D) 70 (E) 90
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.