I still don't quite understand the question about Facebook's valuation.

"Facebook stock trading was particularly strong last month. Facebook's early sponsors were venture capital company Accel Partners. According to people familiar with the matter, the company sold less than November of its shares at a price of $0.517 billion in 15%. After the huge deal, Facebook shares began to surge. Some tech blogs have covered some details of the deal, and these people familiar with the matter said the deal will set Facebook's value to around $35 billion ."

Why did 35 billion get it? 5.17 * (100/15), then multiply by 10? What does this mean?