Question 9
A city has 6 horizontal and 6 vertical roads forming 36 intersections. Flowers grow at every intersection. A watering truck must visit them all on a closed route, starting away from an intersection. What is the least number of turns it must make?
Editorial clarification: Follow the shown horizontal and vertical roads; count a change between them as a turn.
Editorial clarification: Follow the shown horizontal and vertical roads; count a change between them as a turn.