There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

What makes this number unique: 8,549,176,320?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

I make two people out of one. What am I?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

What has many keys but can’t open a single lock?

What does this Rebus Picture mean?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

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