The mean (average) of 6, 9 and 18 is equal to the mean (average) of 12 and y. What is the value of y?
(A) 22 (B) 21 (C) 10 (D) 11 (E) 5
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.