How to solve the problem of planting trees in grade four?

Hi!

Two species: plant number = interval number+1 interval number = plant number-1 distance = spacing * interval number distance = spacing * (plant number-1)

No planting at both ends: plant number = interval number-1 interval number = plant number+1 distance = spacing * interval number distance = spacing * (plant number+1)

One head does not plant one head: number of plants = number of intervals = number of plants = distance = number of intervals * distance = number of intervals * number of plants.

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