Find the value of "?" in the ball picture Riddle below:

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Why do you find that most of the buildings are deprived of the 13th floor?

Which word does the below Plexor means ?

Count the number of lines in the image below ?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Using Only Five 5's and any mathematical operator make sum as 37

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

Mr. Buttons was all set to go to the village of Buttonland to meet his friend. So, he packed his bags and left for the village at 5 in the morning. Upon travelling on a road for miles, he came across a point where the road diverged into two. He was confused on which road to take. He gazed around and he saw two owls sitting on a branch. He thought he could ask for directions for the village from the two owls. So he went to the tree. There he saw a sign which read, "One owl always lies, and one is always truthful. They both fly away if you ask them more than 1 question."
Mr. Buttons was caught in the dilemma of what to ask? And from which owl to ask, since he only had one question. What should Mr. Buttons ask?