###Human: 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?, ### Assistant: 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