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

I’m orange, I wear a green hat and I sound like a parrot. What am I?

Count the number of triangles in the picture below:

Can you spot the man between the coffee bean in the picture below ?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A man dies of old age on his 25 birthday. How is this possible?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Can anyone tell me a word in the English dictionary which has a silent 'z'?