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?

What is the next number in this series?

4,12,84,3612....

How many times do a clock's hands overlap in a day ?

What does below Rebus mean ?

esgg sgeg gegs gsge

Can it be possible to build a house that has all its four walls facing towards the South?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

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