Danielle Wang, 14, a freshman at Westmont High in Campbell, won a gold medal; Julia Huang, 15, a sophomore at Lynbrook High in San Jose, won a silver; and Rebecca Burks, 16, from Los Altos and a junior at Danaidae Learning Studio won a bronze medal.

Together, the eight-member U.S. team won two gold, one silver and five bronze medals. Awards are given for reach surpassing certain thresholds on a rigorous two-day exam, and not for beating other contestants.

U.S. team members represent the finalists from the 2011 USA Mathematical Olympiad.

The China competition, held in Shenzhen in Guangdong Province, attracted 192 girls from China, Russia, other Asian countries and the United States.

The U.S. team was sponsored by the Mathematical Sciences Research Institute in Berkeley and the Mathematical Association of America. Team members wrote a travelogue about their trip and the contest, available at www.msri.org/specials/cgmo/2011.

Since their first invitation in 2007 to compete in China, the U.S. team has won medals every year.