User Count

If this is your first time visiting this page, edit it by incrementing the user count below by one.



Hi Everyone,

I am a hedgehog who likes Message Board halping, funny pictures, emoji wars, and AoPS Wiki contributions. Keep these fun things coming!

This hedgehog represents my attitude towards math--enthusiastic and victorious!


And here is my personified self-portrait:



AoPS Bio

Jerry graduated from Northeastern University in 2018 as a mathematics and computer science combined major. He has ten years of experience working with students. During his last two years in high school, he served as the math club president and prepared lively lectures on contest math. As a result, he inspired many kids to get interested in math and participate in math competitions (such as AMC and ARML). For the last eight years, he has worked with Math League to write math contests for students from grades 4 through 12 in the USA. Starting in 2019, he has served as an instructor and a Message Board Halper for many AoPS online classes and truly enjoyed that experience! In his mind, nothing is more rewarding than educating tomorrow’s bright minds. In his spare time, he loves contributing to the AoPS Wiki and playing chess and all sorts of board games, especially Scotland Yard and Samurai.


Below are my contributions to the AMC/AIME Problems' Solutions in the AoPS Wiki. I understand that in this communal Wiki, we all have to collaborate and make compromises. In any of my solutions, if you find flaws and/or want major revisions, please contact me via my user talk page or the private messaging system before you take action. I am sure that we can work things out.

Thank you for your cooperation, and hope you enjoy reading my solutions. :)


1984 AIME

1985 AIME

1986 AIME

1988 AIME

1990 AIME

2009 AMC 10B

2009 AMC 12B

2018 AMC 12A

2020 AMC 8

2020 AMC 10A

2020 AMC 10B

2020 AMC 12A

2020 AMC 12B

2020 AIME I

2020 AIME II

2021 AMC 10A

2021 AMC 10B

2021 AMC 12A

2021 AMC 12B

2021 AIME I

2021 AIME II

External Links

  • User Talk Page
    Welcome to my user talk page here. Feel free to leave any message you like.
  • Flame Kho's User Page
    Recently I am helping my friend Flame Kho to create his user page. Enjoy his AMC Solutions and artworks! $\smiley{}$
Invalid username
Login to AoPS