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On the planet Ozernaya 55lakes interconnected 111 canals, so that from each lake you can swim to any other. How many islands on the planet? The planet has the shape of a ball and the island we call any part of the land that is limited to water.

165
425
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Saneitrix
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1) 160+140=300(м)-они прошли. 2)1000-300=700(м)

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