Input: Read this: The city's K-12 enrollment in district run schools has dropped in the last five years from 156,211 students in 2010 to 130,104 students in 2015. During the same time period, the enrollment in charter schools has increased from 33,995 students in 2010 to 62,358 students in 2015. This consistent drop in enrollment has led the city to close 24 of its public schools in 2013. During the 2014 school year, the city spent an average of $12,570 per pupil, below the average among comparable urban school districts.
Question: How many public schools have been closed in 2013?

Output: 24

Input: Read this: Mechanical pulping yields almost a tonne of pulp per tonne of dry wood used, which is why mechanical pulps are sometimes referred to as "high yield" pulps. With almost twice the yield as chemical pulping, mechanical pulps is often cheaper. Mass-market paperback books and newspapers tend to use mechanical papers. Book publishers tend to use acid-free paper, made from fully bleached chemical pulps for hardback and trade paperback books.
Question: What level of acid is not usually found in the paper used by book publishers?

Output: unanswerable

Input: Read this: The Northwestern Interdisciplinary Law Review is a scholarly legal publication published annually by an editorial board of Northwestern University undergraduates. The journal's mission is to publish interdisciplinary legal research, drawing from fields such as history, literature, economics, philosophy, and art. Founded in 2008, the journal features articles by professors, law students, practitioners, and undergraduates. The journal is funded by the Buffett Center for International and Comparative Studies and the Office of the Provost.
Question: Who publishes The Northwestern Interdisciplinary Law Review?

Output: an editorial board of Northwestern University undergraduates

Input: Read this: The Freeview HD service currently contains 10 HD channels (as of December 2013[update]) and was rolled out region by region across the UK in accordance with the digital switchover process, finally being completed in October 2012. However, Freeview HD is not the first HDTV service over digital terrestrial television in Europe;
Question: Which service contains 10 HD channels and finished its roll out in October 2022?

Output:
unanswerable