What does this rebus means ?

PROG WORKRESS

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Remove two matchsticks to make the below equation correct.

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

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 ?

The more it dries, the wetter it becomes. Can you tell what it is?

Look at the picture and find out which square is not linked with any of the other squares.

How high do you have to count before you use the letter “a” in the English spelling of the whole number?