diff --git a/01_Day_JavaScript_Refresher/main.js b/01_Day_JavaScript_Refresher/main.js
index bfd08ba..072da7b 100644
--- a/01_Day_JavaScript_Refresher/main.js
+++ b/01_Day_JavaScript_Refresher/main.js
@@ -33,7 +33,20 @@ const backEnd = ['Node', 'Express', 'MongoDB']
 
 const fullStack = frontEnd.concat(backEnd)
 
-console.log(fullStack)
+console.log(fullStack);
 
+const ages = [ 19, 22, 19, 24, 20, 25, 26, 24, 25, 24 ]
 
+const sortedAges = ages.sort((a,b) => a - b );
+console.log(sortedAges[ 0 ],sortedAges[sortedAges.length - 1],(sortedAges[ 0 ] + sortedAges[sortedAges.length - 1 ] )/ 2 )
 
+console.log(countries.slice( 0, 10 ))
+
+countries.length % 2 === 0  ?
+    countries.slice( 0,countries.length / 2 )
+ :
+    countries.push('Turkey')
+    countries.slice( 0,countries.length / 2 )
+
+
+console.log(countries.slice( 0,6 ),countries.slice( 6,12 ));