question: What was the approximate population of London children aged 0 to 15 years at the time of the 2011 census ?
answer: 1,624,768
turker_answer: At the time of the 2011 census , the approximate population of London children aged 0 to 15 years was 1,624,768 .
rule-based: The approximate population of London children aged 0 to 15 years at the time of the 2011 census was 1,624,768 .