What does this rebus means ?

PROG WORKRESS

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Who has married many women but was never married?

Can you find the dog hidden in a group of pandas?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?