What is wrong in the below Picture?

What can you deduce from the following BrainBat?

CRY
LMKI

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Imagine you are in a room with no windows or doors. How will you get out?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?