During a long-distance relay event, Emek and Luna organized hydration stations along the course. The race guide recommended 30 liters of water for every 20 runners. When registration increased to 35 runners at one station, they set up a proportion to calculate the new amount of water needed. They repeated the process for other stations with different numbers of runners and checked that each calculation matched the planned supply ratio. Thanks to their careful planning, every hydration station remained properly stocked, and the race finished without any runners running out of water.