2 files changed, 24 insertions, 0 deletions
diff --git a/prolog/problems/lists/sum_2/common.py b/prolog/problems/lists/sum_2/common.py
new file mode 100644
index 0000000..14b0614
--- /dev/null
+++ b/prolog/problems/lists/sum_2/common.py
@@ -0,0 +1,12 @@
+id = 118
+group = 'lists'
+number = 25
+visible = True
+facts = None
+
+solution = '''\
+sum([], 0).
+sum([H|T], Sum) :-
+  sum(T, SumT),
+  Sum is SumT + H.
+'''
diff --git a/prolog/problems/lists/sum_2/en.py b/prolog/problems/lists/sum_2/en.py
new file mode 100644
index 0000000..8db0e67
--- /dev/null
+++ b/prolog/problems/lists/sum_2/en.py
@@ -0,0 +1,12 @@
+id = 118
+name = 'sum/2'
+slug = 'find the sum of all elements in list'
+
+description = '''\
+<p><code>sum(L, Sum)</code>: <code>Sum</code> is the sum of all elements in the list <code>L</code>.</p>
+<pre>
+  ?- sum([1,2,3], Sum).
+    Sum = 6.
+</pre>'''
+
+hint = {}