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?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

What type of tree can I carry in my hand?

What is full of holes but still holds water?