Complete the table series riddle by finding the number that can replace "??".

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?

What four weights can be used to balance from 1 to 30 pounds?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

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

What has one letter and starts with an E?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?