What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

How many times in a given day, minutes and hour clock comes in a straight line ?

What has no start, end, or centre?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

What is the word or phrase below?
R | E | A | D

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Count the Triangle in the figure given below:

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

What does a man do only once in his lifetime, but women do once a year after they are 29?