A: If we change the light bulb we'll have to change everything.
None, they arrest the room because it's black.
One
A: 50. One to screw in the light bulb and the remaining 49 to guard him .
Two. The light bulb you remove and the light bulb you replace it with.
A: It was supposed to be in place last week!
A: Three. One to screw it in and two more to hold down the editor.
