gistfile1.rb

1.9.3p392 :016 > numbers.each { |n|
1.9.3p392 :017 >     if n % 20 == 0
1.9.3p392 :018?>     puts "yay"
1.9.3p392 :019?>     end
1.9.3p392 :020?>   }
 => [2, 3, 4, 5]
1.9.3p392 :021 > 4 % 20
 => 4
1.9.3p392 :022 > 4 / 20
 => 0
1.9.3p392 :023 > 5 / 20
 => 0
1.9.3p392 :024 > 11/20
 => 0
1.9.3p392 :025 > 11 % 20
 => 11
1.9.3p392 :026 >