Question
Some lamp posts are placed along a street at equal distances.
The distance between the 2nd and the 6th lamp post is 20 m.
The distance between the 1st and the last lamp post is 50 m.
How many lamp posts are there altogether?
4 m

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Some lamp posts are placed along a street at equal distances.
The distance between the 2nd and the 6th lamp post is 20 m.
The distance between the 1st and the last lamp post is 50 m.
How many lamp posts are there altogether?