The puzzle is quite simple: An elephant and a mouse together weigh 1001 kg, the elephant weighs 1000 kg more than the mouse. How much does the mouse weigh?
As you can see, the puzzle is quite simple and very basic. But remember that before answering, take a few seconds to think and get your accounts too if you wish.
Hint: If you think the elephant weighs 1000 kilos, let me tell you that you are wrong. Sorry, it is not the correct answer.
Which is the right answer?