diff --git a/exercises/ex10/ex10b.py b/exercises/ex10/ex10b.py
index b6a6042..379bd1a 100644
--- a/exercises/ex10/ex10b.py
+++ b/exercises/ex10/ex10b.py
@@ -2,3 +2,37 @@
 Project: Deleting Unneeded Files
 Page 247
 """
+
+import sys
+from pathlib import Path
+
+
+def get_path():
+    if len(sys.argv) != 2:
+        print("ERROR: solo un argumento es necesario")
+        sys.exit(1)
+    path = Path(sys.argv[1])
+    if not path.is_dir():
+        print(f"ERROR: '{path}' no es una ruta a un directorio")
+        sys.exit(1)
+    return path.resolve()
+
+
+root = get_path()
+size_max = 100
+big_files = []
+
+for path in list(root.glob("**/*")):
+    size_mb = round(path.lstat().st_size / (1024*1024), 2)
+    if size_mb >= size_max:
+        big_files.append({"size": size_mb, "path": path})
+
+print(f"Mostrando archivos >= a {size_max}MB:")
+# print(f"Eliminando archivos >= a {size_max}MB:")
+big_files = sorted(big_files, reverse=True, key=lambda f: f['size'])
+biggest = str(format(big_files[0]["size"], ","))
+for file in big_files:
+    size = str(format(file["size"], ","))
+    space = " " * (len(biggest) - len(size))
+    print(f"[{space}{size}] {file['path']}")
+    # file["path"].unlink()  # PELIGRO: si se descomenta eliminará el archivo