Question
Some trees are placed along a street at equal distances.
The distance between the 2nd and the 5th tree is 9 m.
The distance between the 1st and the last tree is 18 m.
How many trees are there altogether?
4 m

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Some trees are placed along a street at equal distances.
The distance between the 2nd and the 5th tree is 9 m.
The distance between the 1st and the last tree is 18 m.
How many trees are there altogether?