A scientist puts a bacteria in a petri dish at exactly noon.
Every minute the bacteria divides into two and doubles in size. At exactly 1 PM the petri dish is full.
At what time was the dish half full?
Riddle AnswerBest Riddles
Two Angels
You are standing in front of two gates (a left one and a right one) – one leads to Heaven and the other leads to Hell. You don’t know which gate leads where. Beside the gates, there are two angels. One of them always tells the truth and the other always lies, but you don’t know which one is which.
You have one question to ask one of the angels, in order to find out which gate will lead you to Heaven. What would that question be?
Riddle AnswerRunning a Race
If you were running a race and you passed the person in 2nd place, what place would you be in now?
Riddle Answer3 Switches and 1 Light Bulb
You have a set of 3 light switches outside a closed door. One of them controls the incandescent light bulb inside the room. With the door closed from outside the room, you can turn the light switches on or off as many times as you would like.
You can go into the room – one time only – to see the light. You cannot see whether the light is on or off from outside the room, nor can you change the light switches while inside the room.
No one else is in the room to help you. The room has no windows.
Based on the information above, how would you determine which of the three light switches controls the light inside the room?
Riddle Answer3 Switches and 3 Bulbs
You are standing in a hallway next to 3 light switches that have been switched off. There is another room down the hallway with 3 light bulbs – all are incandescent light bulbs and each light bulb is operated by one of the switches in the hallway.
The door to the room is closed and you cannot see the light bulbs from the hallway.
How would you figure out which switch operates which light bulb, if you can enter the room with the light bulbs only once?
Riddle Answer