It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What does below Rebus say?

XLR8

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

Identify the hidden meaning behind this picture?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What demands an answer, but asks no questions