There are 12 tanks - which tank will be fill first? This is very viral puzzle in whatsapp and facebook. Can you solve this puzzle? for 6 tanks puzzle - www.youtube.com/watch?v=G678jJLMz0A for 4 tanks puzzle - www.youtube.com/watch?v=U0o1KLBcGLE more puzzles - www.logicalbaniya.com/category/puzzles/