Question
Stools are placed at an equal distance from one another along the hallway. The distance between the 9th and the 18th stool is 11 m. What is the distance between the 1st and the 18th stool?
4 m

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Stools are placed at an equal distance from one another along the hallway. The distance between the 9th and the 18th stool is 11 m. What is the distance between the 1st and the 18th stool?