Question: "There are over how many art works displayed at Yerevan?"

Context: "The National Art Gallery in Yerevan has more than 16,000 works that date back to the Middle Ages, which indicate Armenia's rich tales and stories of the times. It houses paintings by many European masters as well. The Modern Art Museum, the Children’s Picture Gallery, and the Martiros Saryan Museum are only a few of the other noteworthy collections of fine art on display in Yerevan. Moreover, many private galleries are in operation, with many more opening every year, featuring rotating exhibitions and sales."

Answer:
16,000
The question is asking how many works are displayed at the Yerevan National Art Gallery. The context says that "the National Art Gallery in Yerevan has more than 16,000 works". Therefore, there are over 16,000 artworks on display at this gallery and therefore the answer to the question is 16,000..