Can you replace the question mark with the correct number?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

There is something which you can be arrested for attempting but not for successfully completing.

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Spot 5 differences in two Christmas tree below:

How can you make a TV, a bed, a dog, and a car liquid?

Why 1729 is a magic number? Answer Logically.

Solve this riddle by finding the odd one out from the rest.

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?