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# CMO/CJMO 2023

## CMO 2023 Results

CMO 2023 Champion: Warren Bei

Congratulations to  Warren Bei who attends Rockridge Secondary School in West Vancouver, BC!

Warren has earned this year’s CMO Cup and the top prize of \$2,000 cash!
Rank Name School
Gold Medal Warren Bei Rockridge Secondary (West Vancouver, BC)
Silver Medal Andrew Wen Phillips Academy (Andover, MA, USA)
Bronze Medal Marvin Mao Bergen Country Academies (Hackensack, NJ, USA)
Honourable Mention Emily Ma Marc Garneau Collegiate Institute (Toronto, ON)
Joshua Wang Brookfield Central High School (Brookfield, WI, USA)
Kaixin Wang Magee Secondary School (Vancouver, BC)
Ming Yang Brophy College Preparatory (Phoenix, AZ, USA)

### Statistics

• Top score: 29/35
• Lowest score for the top quartile: 14/35
• Median score: 9/35
• Competitors: 89 (77 official, 12 unofficial)

### Matthew Brennan Award for Best CMO Solution

The Award this year goes to Ming Yang of Brophy College Preparatory (Phoenix, AZ, USA) for his solution to problem 3.

The question asked students to prove a geometric inequality, and Ming Yang recasted the claim as a three variable inequality where the variables were shown to sum to 1 by a slick argument involving areas. The solution was finished with a direct application of Jensen’s inequality. The entire solution was just over half a page, and very elegant!

## CJMO 2023 Results

CJMO 2023 Champion: Perry Dai

Congratulations to Perry Dai who attends University of Toronto Schools in Toronto, Ontario!

Rank Name School
Gold Medal Perry Dai University of Toronto Schools (Toronto, ON)
Silver Medal Raymond Ouyang William Lyon Mackenzie Collegiate Institute (North York, ON)
Honourable Mention Amos Zhang University of Toronto Schools (Toronto, ON)
David Zhang York Mills Collegiate Institute (Toronto, ON)