The Terrain
The brothers Luiz and Lucio bought a land surrounded by a wall of . They built an inner wall to divide the land into two parts. Now, the part of Luiz is surrounded by a wall of and the part of Lucio by a wall of . What is the length of the inner wall?
The answer is 80.
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let the length of the wall be x, then
(240 -x) + (260 -x) = 340,
x = 80