Why is the Hole below a Lock?

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?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Can you count the number of triangles in the given figure?

What makes this number unique: 8,549,176,320?

Complete the table series riddle by finding the number that can replace "??".

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

I look at you, you look at me I raise my right, you raise your left. What am I?

Find the number of squares in the below-given picture.

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?