diff --git a/t13_mean2.py b/t13_mean2.py
index 99f281b..1de1dc2 100644
--- a/t13_mean2.py
+++ b/t13_mean2.py
@@ -10,3 +10,10 @@
   total -= num
 
 print(total)
+
+mean = 52
+known = [34, 23, 65, 91]
+sumOfNumbers = mean * 5
+for number in known:
+  sumOfNumbers -= number
+print(str(sumOfNumbers) + " is the value of x")