In the Netherlands, <answer>four</answer> former institutes of technology have become universities over the past decades. These are the current three Technical Universities (at Delft, Eindhoven and Enschede), plus the former agricultural institute in Wageningen. A list of all hogescholen in the Netherlands, including some which might be called polytechnics, can be found here.
How many institutes of technology in the Netherlands have converted into full-fledged universities in the past few decades?
four