South Africa's Gordhan opens with a joke, but tone is serious

By Ed Cropley JOHANNESBURG (Reuters) - Introducing South Africa's third finance minister in five days, it was perhaps inevitable the government spokeswoman would get names wrong, confusing Pravin Gordhan, who was appointed on Sunday night, with Nhlanhla Nene, who was dismissed last week. In between came David van Rooyen, a little-known backbencher with no central government experience whose period in charge of the purse strings of Africa's most sophisticated economy lasted less than 100 hours. D