hoeveel voetballen worden er voor de WK in zuid afrika gebruiken?

Per wedstrijd zeker. Elke nieuwe wedstrijd start met een nieuwe serie ballen.
Kan even zo gauw geen link maar vinden, maar dat heb ik onlangs ergens gelezen.

Per speelhelft lijkt me sterk.

Toegevoegd na 17 minuten:
Ik ben nog even verder wezen zoeken, heb wel het volgende gevonden op de website van de FIFA.

" At the 2006 FIFA World Cup Germany, the balls will have even greater symbolic value. For the first time in the tournament's history, each of the 15 match balls that will be made available for each game, and used wherever necessary to increase the time that the ball is in play, will carry a special inscription with the match number, match venue, the date and the teams.

This applies for each of the balls currently being ferried through Germany to Munich in time for the opening game, a journey being documented by German TV channel ZDF, and which will be received by OC President Franz Beckenbauer before kick-off between Germany and Costa Rica. According to FIFA, each team will be able to claim and sign for one of the balls from the FIFA Co-ordinator after each game. FIFA, the OC and the match officials will also each receive one as a souvenir.

A total of 960 balls will be specially inscribed for the 64 games. Official Partner adidas will also supply each of the 32 FIFA World Cup participants with 40 "Teamgeist" tournament balls, 1280 in total, for training purposes. These balls, which will not carry the special inscription, may also be kept by the teams."

http://www.fifa.com/worldcup/archive/germany2006/news/newsid=34546.html

Ik ga er vanuit dat ze het voor dit toernooi ook op die manier wel gedaan hebben, maar dat kan ik dus nergens meer vinden.