What does this rebus means ?

PROG WORKRESS

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

I am an odd number. Take away a letter and I become even. What number am I?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

There is something which is always coming but never arrives?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

You need to move three matchsticks to form three squares. Can you do it?