Question
Some flower pots are placed along a street at equal distances. The distance between the 1st and the 4th flower pot is 21 m. The distance between the 1st and the last flower pot is 63 m. How many flower pots are there altogether?
4 m

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Some flower pots are placed along a street at equal distances. The distance between the 1st and the 4th flower pot is 21 m. The distance between the 1st and the last flower pot is 63 m. How many flower pots are there altogether?