
Rafa-Dodd wrote:Will Harry beat Lord Voldemort?
stmichael wrote:A few brainteasers for today.
1. It takes a man an hour to dig a hole. How long does it take two men to dig half a hole?
2. A water lily growing in a circular pond doubles in size every day. It takes thirty days to cover the whole pond. How long does it take to cover half the pond?
3. A builder builds 100 houses. He has to number them all so he goes to the hardware store. How many no. 9's does he buy?
4. A man is travelling from the country to Dublin. He comes to a T-Junction. There are no signposts. He spots a house down the road and decides he will go and ask whoever lives there the way to go. Just before he enters the garden, a little boy comes up and tells him that there are twins living in the house on their own. He says that one of them always tells the truth and one of them always lies and that no one can tell which is which. He also says that anyone who wants information can only ask them one question and that is it.
Bearing in mind that he won't know which twin answers the door.. what question does he ask, and then, what action does he take to make sure he goes the right way?
5. Spot the error in this? There was a taxi outside a hotel. A man came out, hit the taxi driver on the head, took all the money out of the meter and started to run off, only to be rugby-tackled by the commissionaire?
6. A farmer has to transport a fox, a goose and a sack of grain across a river. The boat is so small that there is room only for him and one of the others at a time, but if he leaves the fox and goose together the fox will kill the goose, and if the goose and the sack of grain are left together the goose will eat the grain. How does he get them all over?
Answers to follow within the next 48 hours.
stmichael wrote:some more to keep you occupied.![]()
A. Imagine you are in a room with 3 switches. In an adjacent room there are 3 bulbs (all are off at the moment), each switch belongs to one bulb. It is impossible to see from one room to another. How can you find out which switch belongs to which bulb, if you may enter the room with the bulbs only once?
B. A table tennis ball fell into a tight deep pipe. The pipe was only a bit wider then the ball, so you can not use your hand. How would you take it out, with no damage?
C. A man lives on the tenth floor of a building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator - or if it was raining that day - he goes back to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment. Can you explain why?
D. How can you throw a ball as hard as you can and have it come back to you, even if it doesn't hit anything, there is nothing attached to it, and no one else catches or throws it?
dawson99 wrote:ok, a riddle:
AND A LIGHT BULB
>=P 100 prisoners are imprisoned in solitary cells. Each cell is windowless and soundproof. There's a central living room with one light bulb; the bulb is initially off. No prisoner can see the light bulb from his or her own cell. Each day, the warden picks a prisoner equally at random, and that prisoner visits the central living room; at the end of the day the prisoner is returned to his cell. While in the living room, the prisoner can toggle the bulb if he or she wishes. Also, the prisoner has the option of asserting the claim that all 100 prisoners have been to the living room. If this assertion is false (that is, some prisoners still haven't been to the living room), all 100 prisoners will be shot for their stupidity. However, if it is indeed true, all prisoners are set free and inducted into MENSA, since the world can always use more smart people. Thus, the assertion should only be made if the prisoner is 100% certain of its validity.
Before this whole procedure begins, the prisoners are allowed to get together in the courtyard to discuss a plan. What is the optimal plan they can agree on, so that eventually, someone will make a correct assertion?
peewee wrote:number 3, they will both be the same distance from new york
s@int wrote:peewee wrote:number 3, they will both be the same distance from new york
The back of the first train will be nearer surely ?
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