AMO 2027 Grades 4-5 SET 23 - Self-study Question 4

Trees are planted on one side of Liang Street. Two consecutive trees are 8 meters away from each other and trees are planted at the two ends of Liang Street. If there are 21 trees in total, how long is Liang Street?

Measure along the straight row of trees, including both endpoint trees; answer choices are in metres.