Task: Question Answering
Input (English): Passage: There were 664,594 households out of which 24.35% had children under the age of 18 living with them, 46.28% were Marriage living together, 11.68% had a female householder with no husband present, and 37.40% were non-families. 30.11% of all households were made up of individuals and 14.70% (4.02% male and 10.68% female) had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.97. 
Question: How many more married households existed than non-families? 
Answer type: Number 
Output (English): 8.88.