According to the Mathematical Association of America (MAA), the competition involves six problems taken in sets of three during 4.5 hour sessions (held across two days)—no calculators. Each team member attempts the problems, and team totals are based on the number of points each individual scores. The US earned 185 to take the gold while China earned runner-up honors with 181. It's the US' fifth victory overall. China has the most competition wins with 19 all-time, including winning four of the last five competitions heading into the 2015 edition.
Link to article with its image of a sample problem from the competition. It's rare to hear positive news about math education in the United States.
(Score: 3, Insightful) by Francis on Tuesday July 21 2015, @04:39PM
That's high end competition in basically any field. The difference in times for something like the 100m sprint is measured in small fractions of a second. With times coming in at under 10 seconds, a bad nights sleep can take a person from 1st to last just based upon decreased reaction time.