How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

Move three sticks of the spiral below to form a square.

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

What is the Surname of Barbie Doll?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

Can you find the key in the picture below?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?