Riddle: In a contest, there are four fruits (an apple, a banana, an orange, and a pear) which have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. There were 123 participants in the contest. The results are; 43 people guessed none correctly, 39 people guessed one correctly and 31 people have guessed two correctly. How many people guessed three correctly and how many people guessed all four correctly?
Answer: It is not possible to only get three correct because the fourth would also be correct. Therefore, the answer would be (123-43-39-31 = 10) 10 people guessed all four correctly.
Riddle: You have 14 brown socks, 14 blue socks and 14 black socks in your sock drawer. How many socks must you remove (without looking to be sure) to have a matched pair?
Answer: Four. You will have a pair of one color or another.
Riddle: A certain number has three digits. The sum of the three digits equals 36 times this number. Seven times the left digit plus 9 is equal to 5 times the sum of the two other digits. 8 times the second digit minus 9 is equal to the sum of the first and third.
What is the number?
Answer: This one is fairly easy - 324 is the answer.
Riddle: A 300 ft. train is traveling 300 ft. per minute must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?
Answer: Two minutes. It takes the front of the train one minute and the rest of the train will take two minutes to clear the tunnel.