Building Puzzle

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




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Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

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I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

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What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

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If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

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Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

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An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

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It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

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What do you see in the given picture?

Are you Intelligent ?

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You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

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What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

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Amazing Facts

Rubik’s Cube

The inventor of the Rubik’s Cube didn’t realize he’d built a puzzle until he scrambled it the first time and tried to restore it.