Question: How many Australian campuses are in the university in which Central Hall is part of?

Context paragraphs:
Mawdesley Hall: Mawdesley Hall is a country house in New Street, Mawdesley, Chorley, Lancashire, England.  It consists of a central hall with two cross-wings.  The central hall was built in the 17th century, its lower storey being timber-framed and its upper floor plastered and painted to resemble timber-framing.  The cross-wings were added in the late 18th or early 19th century.  The west wing is in sandstone, and the east wing is in brick with stone dressings.  The hall is recorded in the National Heritage List for England as a designated Grade I listed building.

Bilbao Arena: Bilbao Arena is an indoor arena in the neighbourhood of Miribilla in Bilbao, Spain.  The central hall can hold up to 10,014 people for basketball games.  The central hall is also used for concerts and other kinds of shows.  The facilities also include swimming pools and gymnasiums for the use of the local residents.

Central Hall, Melbourne: Central Hall (also known by its former name, Cathedral Hall) is a building that stands at the end of Brunswick Street in Fitzroy, Melbourne, Australia.  This structure today serves as a centrepiece of Australian Catholic University's St. Patrick's Campus.  It once held a similar role within Melbourne’s Roman Catholic (and predominantly Irish) community, from the time the hall and adjoining clubrooms were opened in 1904.

National Union of Students (Australia): The National Union of Students (NUS) is the peak representative body for Australian university students.  As of 2016, 17 student unions in Australian campuses affiliated to NUS.  A university is eligible by its classification as a legitimate training provider and the payment of Union fees by the university according to the number of full-time study units of its students.

Elmwood (Culpeper, Virginia): Elmwood is a historic home located at Culpeper, Culpeper County, Virginia.  It was built between 1870 and 1874, and is a three-story, double-pile brick dwelling in the Italianate style.  It has a central hall plan with a central hall stairway.  Also on the property are the contributing outdoor kitchen and smokehouse.  The interior features well-preserved interior mural paintings by the well-known local artist, Joseph Oddenino.  Oddenino also created the interior of the Mitchells Presbyterian Church.

Manchester and Salford Wesleyan Methodist Mission: The Manchester and Salford Wesleyan Methodist Mission was set up in 1886 in Greater Manchester, North West England.  The Central Hall building on Oldham Street became the head office for the mission.  Before Central Hall was built, there was a previous chapel (called the Oldham Street Chapel), which was opened by John Wesley in 1781.  John Wesley and his brother Charles Wesley were the founders of Methodism in England in 1729; the Manchester and Salford Wesleyan mission was named after them, as were many other missions (and missionaries).  There were “numerous and flourishing voluntary societies to combat vice, and religious societies to enlighten the faithful”; the society set up by the Wesley brothers in Oxford in 1729 was “to prove that the decline of the religious spirit had been exaggerated”.  When the chapel in Oldham Street was demolished, it was replaced by the Methodist Central Hall (which housed the Manchester and Salford Wesleyan Mission).

Australian heavy metal: Australian heavy metal music has its roots in both the Australian hard rock and pub rock tradition of the 1970s and the American and British heavy metal scenes.  Since the mid-1980s, Australian heavy metal has been particularly influenced by foreign bands, particularly Swedish death metal, American thrash metal and black metal from Norway.  Within Australia heavy metal has always remained part of the underground but since the mid-1990s many Australian metal acts have found widespread acceptance in overseas markets, particularly in Europe.

Medium-density housing: Medium density housing is not new.  Many traditional types of housing developed prior to car-based cities were at comparable densities, such as the terraced, row or courtyard housing found in many parts of the world.  The inner suburbs in many Australian cities and those activity centres developed during the late Victorian suburban boom have examples of medium density housing.  Since the 1960s, many Australian states have encouraged urban consolidation policies which have facilitated the construction of medium density housing.

Methodist Central Hall, Westminster: The Methodist Central Hall (also known as Central Hall Westminster) is a multi-purpose venue and tourist attraction in City of Westminster, London.  It serves primarily as a Methodist church and a conference centre, but also as an art gallery and an office building (formerly as the headquarters of the Methodist Church of Great Britain until 2000).  It contains twenty-two conference, meetings and seminar rooms, the largest being the "Great Hall".

Australian Catholic University: Australian Catholic University (ACU) is a publicly funded university with seven campuses around Australia.  It is one of the few Australian universities with a presence in Europe, having opened the Rome Centre in Italy in 2015.

Supporting paragraphs: Central Hall, Melbourne Australian Catholic University
Answer: seven