Amazon Manager Operations interview questions

Two seperate interviews. One math problem. You have 15 minutes to complete the math equation, which shouldn't take more then 10 minutes. Very similar to the sample equation they send you.

Was Identified by a head hunter as potential candidate for Amazon. Attended a meet and great, and later scored a phone interview. All moved fast within days. Interview was routine, bland, situational questions with very little feeback. Interviewer appeared to be "going through the motions" of the whole process. End the interview in about 20 minutes.