At the end of a certain year, the four organizations ranking 5 through 8 in home Internet users in the United States were eBay, the U.S. Government, Amazon, and Lycos, with a combined audience of 112 million users. Taking x to be the eBay audience in millions, y the U.S. Government audience in millions, z the Amazon audience in millions, and u the Lycos audience in millions, it was observed that y-z = z U x-y=3(yu) + 21 and xy + zu = 28. How large was the audience of each of the four organizations at the end of that year? eBay U.S. Government Amazon Lycos x million million million million