A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

Solve this riddle by finding the odd one out from the rest.

Which five letter word can be added at the end of below word to form a
valid word?

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Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What is red and smells like blue paint?

What is harder to catch the faster you run?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?