Question: When was the Prime Minister of Australia born who defeated Abbott in 14 September 2015?

Related documents: [0]  [DOC] Malcolm Bligh Turnbull (born 24 October 1954) is the 29th and current Prime Minister of Australia. He first served as parliamentary leader of the Liberal Party and as opposition leader from 2008 to 2009, and became parliamentary leader and Prime Minister after defeating Tony Abbott at the 2015 Liberal leadership spill. The Turnbull Government was re-elected at the 2016 federal election, but with only a one-seat majority. [END] 
[1]  [DOC] The Abbott Government was the federal executive government of Australia led by Prime Minister Tony Abbott. The Government was made up of members of the Liberal–National Coalition. The Leader of the Nationals, Warren Truss, served as Deputy Prime Minister. Following the 2013 Australian federal election on 7 September, the Coalition defeated the second Rudd Government, ending six years of Labor Government. The Abbott Government was sworn into office on 18 September 2013. Less than two years later on 14 September 2015, Malcolm Turnbull defeated Abbott in a leadership ballot, 54 votes to 44. [END]  
Answer: 24 October 1954
24 October 1954