You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

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

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

When does a USA Potato change its nationality?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?