We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

what's the probability of getting a king or a queen from a pack of 52 cards?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

When it is alive we sing, when it is dead we clap our hands. What is it?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

What famous saying does this rebus mean?

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