Can you replace the question mark with the correct number in the below table sequence?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

What number divided by 4 is the same as that number minus 4?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?