The calculating abilities of a dozen students have added up to a trip to South America this month. These maths whizkids, who coasted through the selection process at the Asian-Pacific Mathematical Olympiad in Hong Kong earlier this month, comprise the SAR team for the 1997 International Mathematical Olympiad (IMO). But for at least one member of the team, Edmond Mok Tze-tao, figuring out ways to travel on the sum of his analytical powers comes almost too easily. He believes the discipline helps hone analytical skills. The Queen's College student, gold-award winner at the Asian-Pacific titles, contested the Olympiad in India last year and in Canada in 1995. 'Hong Kong ranked 20th out of the 70 countries last year and I hope that we can come out with a better result this year,' Tze-tao said. The team was announced at the IMO Hong Kong Selection Contest staged at the Wing Lung Bank Building. Other award-winners were silver medallists Leung Wing-chung of Queen Elizabeth School and Chan Chung-lam of Bishop Hall Jubilee School. Bronze winners were Fung Ho-yin of Tsuen Wan Public Ho Chuen Yiu Memorial College, Vincent Mak Wai-yip of Wah Yan College (Hong Kong), Wong Kwok-tai of Li Po Chun United World College, and Alvin Lau Lap-ming of St Paul's College. Six selected members and six alternate members have been chosen for the trip to Argentina. They flew out on July 20 and will return in two weeks. Dr Chiang Chen, chairman of Chen Hsong Holdings, said the trip would widen students' horizons as well as test their maths skills. The IMO is dedicated to providing a forum for mathematically talented young people throughout the world. The Olympiad has been an annual mathematics event for secondary school students since 1959. The first Hong Kong team competed in 1988. Professor Shum Kar-ping, former chairman of the IMO Olympiad Hong Kong Committee, said the team's participation this year carried special meaning. It is probably the first time the SAR flag will be flown overseas.