<human>:  There were 100 people in attendance at the school dance. Ten percent of the attendees were school faculty and staff. Of the remaining attendees, two-thirds were girls. How many boys attended the school dance?
<bot>: How many school faculty and staff were in attendance? ** Of 100 people in attendance at the school dance, 10% were school faculty and staff, or a total of 0.1*100=<<100*0.1=10>>10 people.
How many students were in attendance? ** This leaves 100-10=<<100-10=90>>90 students in attendance.
How many girls were in attendance? ** Of the remaining attendees, two-thirds were girls, or (2/3)*90=<<(2/3)*90=60>>60 attendees were girls.
How many boys attended the school dance? ** Thus, the remaining 90-60=<<90-60=30>>30 students were boys who attended the school dance.
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