They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

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

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What jumps when it walks and sits when it stands?

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?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

You can see it everyday, But cannot touch it at will. What is it?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

Can you write down eight eights so that they add up to one thousand?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?