A, B, C, D, and E are five different colors: Red, Blue, Green, Yellow, and Black. If Red is not Blue, Blue is not Green, and Green is not Yellow, which color is not mentioned as being different from any other?
Five people are standing in a line: Alex, Brian, Charlie, David, and Ethan. Alex is in front of Brian but behind Charlie. David is behind Ethan but in front of Brian. Who is in the middle of the line?
In a race, there are four competitors: Alex, Brian, Charlie, and Derek. Alex finished before Brian but after Charlie. Derek finished last. Who finished first?