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

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Spot the cat in the picture below

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Why is it very easy to weigh a fish?