Why is it very easy to weigh a fish?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you place three balls such that the equation shown in the picture holds true?

Identify The phrase in the picture.

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

How many triangles are there in the picture below?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?