Literacy rate in the Muslim world varies. Some members such as Kuwait, Kazakhstan, Tajikistan and Turkmenistan have over 97% literacy rates, whereas literacy rates are the lowest in Mali, Afghanistan, Chad and parts of Africa. In 2015, the International Islamic News Agency reported that nearly 37% of the population of the Muslim world is unable to read or write, basing that figure on reports from the Organisation of Islamic Cooperation and the Islamic Educational, Scientific and Cultural Organization.

Answer this question, if possible (if impossible, reply "unanswerable"): What organizations studied literacy in the Muslim World in 2015?
Organisation of Islamic Cooperation and the Islamic Educational, Scientific and Cultural Organization