The document summarizes how to solve a multi-step word problem about filling tanks from inlet pipes and draining from an outlet pipe. It shows setting up an equation where the left side is the number of hours times the fill rate per hour, and the right side is the initial amount plus the change per hour. It uses this to find that in 0.71 hours the tank will be 0.7455 full, and it will take 57.14 minutes to fully fill the tank.