# The Terrain

The brothers Luiz and Lucio bought a land surrounded by a wall of $340 \text{ meters}$. They built an inner wall to divide the land into two parts. Now, the part of Luiz is surrounded by a wall of $260 \text{ meters} ,$ and the part of Lucio by a wall of $240 \text{ meters}$. What is the length of the inner wall?

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