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

Find the next number in the series below

21 32 54 87 131 ?

Count the squares in the matchstick puzzle below?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What came first, the chicken or the egg?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

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

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?