45 minutes tech screener with 2 questions. The first had a math component I wasn't prepared for and I didn't do well. I realized in hindsight that the second question wasn't presented to me properly which lead me down the wrong road in terms of the solution. The inputs weren't what I expected (after confirming with the interviewer what the inputs were). This led to confusion on the interviewers part as the answer sheet she was reading from didn't match what I was doing. I couldn't see the answer sheet so I had no idea there was a mismatch until after the fact. This resulted in the decision to not continue the interview process. I feel the interviewer should have been better trained and been prepared to understand and explain the inputs to the problem better.