Question
Some tarts are displayed an equal distance from one another on a table. The distance between the first and the seventh tarts is 30 cm. The distance between the seventh and the last tart is 55 cm. How many tarts are there altogether?
4 m

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Some tarts are displayed an equal distance from one another on a table. The distance between the first and the seventh tarts is 30 cm. The distance between the seventh and the last tart is 55 cm. How many tarts are there altogether?