Imagine there are 3 coins on the table: gold, silver, and copper. If you make a truthful statement, you will get one coin. If you make a false statement, you will get nothing. What sentence can guarantee you getting the gold coin?
You are given 1000 one dollar bills and 10 envelopes. Put the bills into the envelopes in such a way that someone can ask you for any amount of money from $1 to $1000 and you can give it to them through a combination of the envelopes.
Find a 10 digit number where the first digit (most significant digit) indicates how many zeros are in the number, the second digit indicates how many 1s are in the number etc. till the tenth digit which indicates how many 9s are in the number.
A swimming pool has four taps. The first can fill the entire pool with water in two days, the second in three days, the third in four days, and the last one can fill the pool in 6 hours. How long will it take to fill the pool using all 4 taps together?
Two trains start at the same time, one from London to Liverpool, the other from Liverpool to London. If they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?
A man and a woman live peacefully in a house together. But one day the woman shoots her husband. Then she holds him under water for over five minutes. Finally, she hangs him, but ten minutes later they go out and enjoy a wonderful dinner. How can this be?
A man and a woman live peacefully in a house together. But one day the woman shoots her husband. Then she holds him under water for over five minutes. Finally, she hangs him, but ten minutes later they go out and enjoy a wonderful dinner. How can this be?
Twelve flags stand equidistant along the track at the stadium. The runners start at the first flag. A runner reaches the eighth flag 8 seconds after he starts. If he runs at an even speed, how many seconds does he need altogether to reach the twelfth flag?
A young woman is attending her mother’s funeral. While there, she meets a man she has never seen before and falls in love immediately. After the funeral she tries to find him but cannot. Several days later she kills her sister. Why does she kill her sister?
The Pharoah asked: “Who is the greatest of the gods?” ‘I am not” said Horus. “Anubis is” said Isis. “Isis is lying”, said Anubis. Only one god was telling the truth, the other two were lying. Who is the greatest?
A father and son work in the same factory. The father takes 30 minutes to walk to his factory and the son is able to cover the same distance in only 20 minutes. If the father were to leave the house 5 minutes earlier, how soon would his son catch up with his father?
There are 10 identical bottles of identical pills. Each bottle contains 100 pills. Out of 10 bottles 9 have 1 gram of pills but 1 bottle has pills of 1.1 gram in weight. Given a measurement scale, how would you find the heavy bottle? You can use the scale only once.
Our man Ostap was going home from Kiev. He rode halfway by train – fifteen times as fast as he goes on foot. The second half he went by ox team. He can walk twice as fast as that. Would he have saved time if he had gone all the way on foot? If so, by how much?
There are two books sitting side by side, consisting of exactly 100 pages. The book on the left is upside down. If you add the page number at the extreme left side of the book on the left to the page number at the extreme right side of the right hand book, what is the total?
“Every day at noon,” Lucas said, “a ship leaves Le Havre for New York and another ship leaves New York for Le Havre. The trip lasts 7 days and 7 nights. How many New York-Le Havre ships will the ship leaving Le Havre today meet during its journey to New York?
