2 This is a common misconception from the song that we all have to sing a youngsters the actual number could either be 7 which is the generally accepted answer or 14 depending on how you interpret certain versions of The Bible.

So the answer would be 7 unless you interpret the bible to say 14 but it is not 2 this is because Sheep are considered clean animals, only unclean animals were taken on to the ark in two's.