Question
Some trees are placed along a street at equal distances.
The distance between the 2nd and the 7th tree is 20 m.
The distance between the 1st and the last tree is 40 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 7th tree is 20 m.
The distance between the 1st and the last tree is 40 m.
How many trees are there altogether?