Prove that twice of ten is the same as twice of eleven.

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?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Where do you go to learn how to make ice cream?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

I have an eye but still cannot see.

Who am I?

What does this rebus picture identify?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?