Good Riddles

Question: 4 people walk onto a bus, there are only babies on the bus what is on the bus

Question: What melts in a freezer?

Question: i am boiling hot and freezing col at the same time what am i?

Question: Ive said 'I am 11 years old' however, I'm 21 years old. How is that possible?

Question: 30 cows 28 chickens How many didn't?