Priya bought two plants for a science experiment. When she brought them home, the first plant was 5 cm tall and the second plant was 4 cm. Since then, the first plant has grown 0.5 cm a week and the second plant has grown 0.75 cm a week. Priya represents this situation with the equation 5+0.5w=4+0.75w, where w represents the end of week w. What does the solution to this equation, w=4 represent in this situation?