A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

Take one out and scratch my head, I am now black but once was red. What am I?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What has many teeth, but cannot bite?

81 x 9 = 801. What must you do to make the this equation true?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

What country can make you shiver?

Can you move 2 matchsticks to form four equal sized squares.