This video shows how to make inferences about changes in supply and demand based on information about changes in equilibrium prices and quantities. The problem is taken from Economics: Principles and Applications by Robert Hall and Marc Lieberman, and is Ch. 3 problem #9.
You can find more practice problems via the Practice Problem of the Day category archive or by visiting the Econ Classroom page. You can also be notified of new practice problems by subscribing to the YouTube channel.