question: How much did banks estimate was the value of CDOs sold between late 2005 to the middle of 2007 ?
answer: $ 450bn
turker_answer: Banks estimated that the value of CDOs sold between late 2005 to the middle of 2007 was $ 450 billion .
rule-based: Banks estimated $ 450bn was the value of CDOs sold between late 2005 to the middle of 2007 .