diff --git a/ruby_algo/ex5.rb b/ruby_algo/ex5.rb
new file mode 100644
index 0000000..846a6fe
--- /dev/null
+++ b/ruby_algo/ex5.rb
@@ -0,0 +1,20 @@
+# 2520 is the smallest number that can be divided by each 
+# of the numbers from 1 to 10 without any remainder.
+
+# What is the smallest positive number that is evenly 
+# divisible by all of the numbers from 1 to 20?
+
+x = 1
+n = 10
+a = (1..n)
+
+class Integer
+  def factors() (1..self).select { |n| (self % n).zero? } end
+end
+
+puts x.factors
+
+unless x.to_a.length == 10
+  x +=1
+  x.factors
+end