[Question]: Yanna bought 60 apples. She gave eighteen apples to Zenny. She gave six more apples to Andrea and kept the rest. How many apples did she keep?
[Answer]: After giving 18 apples to Zenny, Yanna remained with 60 - 18 = 42 apples. Since she also gave Andrea 6 apples, Yanna remained with 42 - 6 = 36 apples. Therefore, Yanna kept 36 apples.
So the answer is 36.

[Question]: 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?
[Answer]: Of 100 people in attendance at the school dance, 10% were school faculty and staff, or a total of 0.1 * 100 = 10 people. This leaves 100 - 10 = 90 students in attendance. Of the remaining attendees, two - thirds were girls, or (2 / 3) * 90 = 60 attendees were girls. Thus, the remaining 90 - 60 = 30 students were boys who attended the school dance.
So the answer is 30.

[Question]: Sean and Sierra invited 200 guests to their wedding. If 83% of the guests RSVP with a Yes response and 9% of the guests RSVP with a No response, how many guests did not respond at all?
[Answer]:
Yes RSVP responses are 200 x 83% = 166 guests. No RSVP responses are 200 x 9% = 18 guests. Guests who responded are 166 + 18 = 184. Guests who did not respond at all are 200 - 184 = 16.
So the answer is 16.