$$24 \div 4 = 6$$ 
In the animal school, some sheep are taking lessons. The teacher cow finds out that the sheep have $$24$$ legs altogether. How many sheep are there? (Adapted from 2012 Math Kangaroo Problem, Level 3-4, Question \#14) 
[A] $$6$$ 
[B] $$5$$ 
[C] $$4$$ 
[D] $$3$$ 
[E] $$2$$ 