Task: Question Answering
Input (English): Passage: In the city, the age distribution of the population shows 21.8% under the age of 18, 13.1% from 18 to 24, 31.7% from 25 to 44, 20.1% from 45 to 64, and 13.2% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 87.1 males. For every 100 females age 18 and over, there were 83.5 males. 
Question: How many percent were not under the age of 18? 
Answer type: Number 
Output (English): 78.2.