diff --git a/solutions/sol_223.py b/solutions/sol31.py
similarity index 100%
rename from solutions/sol_223.py
rename to solutions/sol31.py
diff --git a/solutions/sol_52.py b/solutions/sol9.py
similarity index 100%
rename from solutions/sol_52.py
rename to solutions/sol9.py
diff --git a/solutions/sol_111.py b/solutions/sol_111.py
deleted file mode 100644
index 9f44eb5..0000000
--- a/solutions/sol_111.py
+++ /dev/null
@@ -1,4 +0,0 @@
-ann = ANN(2, 10, 1)
-%timeit -n 1 -r 1 ann.train(zip(X,y), iterations=2)
-plot_decision_boundary(ann)
-plt.title("Our next model with 10 hidden units")
diff --git a/solutions/sol_112.py b/solutions/sol_112.py
deleted file mode 100644
index 01d24e4..0000000
--- a/solutions/sol_112.py
+++ /dev/null
@@ -1,4 +0,0 @@
-ann = ANN(2, 10, 1)
-%timeit -n 1 -r 1 ann.train(zip(X,y), iterations=100)
-plot_decision_boundary(ann)
-plt.title("Our model with 10 hidden units and 100 iterations")