what does the below math rebus puzzle mean?

What jumps when it walks and sits when it stands?

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

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

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

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Give it food and it will live; give it water and it will die.

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?