What does this rebus riddle means ?

Can you find out the number that should replace the question mark with a valid reason?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

Which number should replace the question mark?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Why do Chinese men eat more rice than Japanese men do ?

Can it be possible to build a house that has all its four walls facing towards the South?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Can you find out the total number of triangles in the given figure?