The answer depends on the definition of both "white" and "black". As almost no-one actually agrees on which is which, this question becomes almost impossible to answer. If "white" is taken to mean "people of western European descent" and "black" to mean "people of African descent" then blacks considerably outnumber whites - 1.2 billion to around 600 million. But the above calculation effectively restricts itself to North America, Europe and Africa. The world is obviously much larger than that. So ultimately this question actually creates more confusion than it solves.