diff --git a/bt.rb b/bt.rb
new file mode 100644
index 0000000..1151dd6
--- /dev/null
+++ b/bt.rb
@@ -0,0 +1,16 @@
+a = ["hello", "hi"]
+a.map! do |x|
+x.upcase
+end
+puts a
+
+
+a2 = [2,3,4,6,7]
+sum =0
+a2.each do |x|
+sum +=x
+end
+puts sum
+
+a3 =[1,1,1,1,1]
+a4 =[2,657]