Random Images from IMO 2009

We were given the contest problems in 2 languages (in our case, English & Chinese), 20 sheets of paper to do our work, 1 sheet of paper for asking a question to the jury, 3 coloured problem folders per day, and five coloured cards (see below, self-explanatory) which we could use anytime during the competition.


1 coloured folder to contain solution to 1 question. Total 2 white folders (to contain 3 coloured folders for each day), and 6 coloured folders for the 2-day competition.

Day 1 problems.

My solution to Question 1. Scored 7 marks for this.

My solution to Question 2. Scored 7 marks again.

Wrote something for Question 3, to score a miserable 1 mark.

Day 2 problems.

My solution to Question 4. Scored 3 marks for partial solution.

Could not solve Question 5 & 6. Got zero marks for them.

Total score: 18 marks.