Capital One Sr. Data Analyst interview questions

I applied through internal refer and HR patiently walked me through all recruiting process. Code test, Data challenge and On-site interview. Onsite interview has 3 round, case + case+ presentation. I think the whole process is meaningful.

I had a phone interviewed with Capital One, dallas. The HR was nice although at the beginning there were a lot of background noise coming from the HR's side so it was hard to communicate at first. After that, the HR let me introduce myself, then from what I said about myself, she asked specific questions, focusing on my experience with Python and Tableau. This process lasts about 15-20 min. The second half is about basic algebra questions. She gave me some simple questions to solve, and at the end said that she would submit my answers to their data team for decisions. Three days later I got an rejection letter...