If you mean "do legos foat" then yes, they do float as long as you put pressur on them because then the water would cover the Lego and cause it to sink. As long s you leave it alone the Lego will foat on top of water.
The population of Lagos on December 21st 2011 is approximately 4,724,735. (Extrapolated from a population of 13,488,000 in 2006 and a population of 7,937,932 on February 21st 2010.)