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

what does this picture(rebus) riddle means ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

You can see it everyday, But cannot touch it at will. What is it?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

O_er_t_o_

Complete the missing letters of the given word.

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

What runs around the whole yard without moving?