Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Which alphabet letter is a question?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

What two things can you never eat for breakfast?

Can you count the number of squares in the figure below?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?