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

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

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?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I can be cracked, made, told, and played. What am I?

What is the Surname of Barbie Doll?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

What demands an answer, but asks no questions

Can you divide the below-given shape into four equal and identical pieces?

81 x 9 = 801. What must you do to make the this equation true?