Context: Kiev Oblast has 795 state-run schools of general education, 219 (27.5%) of which are situated in urban areas and 576 (72.5%) of which - in rural areas. These schools are attended by 232,260 students, 141,416 (60.6%) which attend urban schools, and 98,944 (39.4%) which attend rural area schools. In addition, there are 12 evening schools with an enrollment of over 6,000 students, 15 private institutions containing about 7,000 students, 23 vocational schools containing over 14,300 students, 22 higher schools with an enrollment of over 34,900 students), and 52 Homeschooling institutions containing over 48,700 children. There are also 756 institutions of Nursery school education attended by a total of 44,400 children, 52 home-school institutions, 22 vocational institutions, having an enrollment of with 17,300 students.

Question: How many more home school institutions were there than private institutions and vocational institutions combined?

Answer:
15