What does this below rebus puzzle mean?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What number should come in place of the question mark below?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

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

Can you find a rabbit in the given picture?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

Why do people go to bed?