Originally Posted by
The Interpreter
You're driving a bus from Ha Noi to Saigon. At the first stop, two red-shirt passengers get on. At the second stop, five blue shirt passengers get on. At the third stop, five purple-shirt passenters get on and one blue-shirt passenger gets off. At the fourth stop, seven green-shirt passengers get on, one purple shirt and two blue-shirt passengers get off. At the next stop, two shirtless passengers get on and talk to the bus driver. They say that the two green-shirt passengers offend them. At the next stop, the driver kicks one green-shirt passenger off the bus and one-black shirt passenger gets on. The black-shirt passenger then get off at the next stop. What is the color of the bus driver's shirt?