This was an entry level (1-2 year experience level) interview, so candidate response can be theoretical, but site practical applications. Some times the question points to a fictitious situation and you need to draw parallels to your past experience. Concepts around supply chain, lean methodologies is good to know. CGN being a management consulting company, gets sometimes vague problem statements from its clients, so consultant's ability is to use a deductive reasoning at first to build basic hypothesis, and then use inductive process once on-site.