Kantar Summer Analyst interview questions

I had an interview with the recruiter at a coffee shop on campus. It probably lasted a little over an hour, but we also talked about other recruiting opportunities that we could potentially implement on campus through an organization I belong to. After the first round interview, I was invited to come to the office the next week to interview for my final round. I spoke to 6 people (2-3 Analysts/Consultants, 1 Associate Director, 1 Partner, Chief of Staff). I only received 2 case interviews. One of the interviews also comprise of a brain teaser (see below) I was given the offer right after my final round as I was leaving the building.