Brain Teasers [Puzzle Sms]
A Petri dish hosts a healthy colony of bacteria. Once a minute every bacterium divides into two. The colony was founded by a single cell at noon. At exactly 12:43 (43 minutes later) the Petri dish was half full.
At what time will the dish be full?
Ans. The dish will be full at 12:44.
The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?
Ans. He was born on December 31st and spoke about it on January 1st. [The day before yesterday (December 30) he was 25. He turned 26 on December 31. He talked about it on January 1. That year he would turn 27, so "next year" he would turn 28.]
You have 12 black socks and 12 white socks mixed up in a drawer. You're up very early and it's too dark to tell them apart.
What's the smallest number of socks you need to take out (blindly) to be sure of having a matching pair?
Ans. U only need 2 take out 3 socks!! [if 1st sock is black... 2nd one could be black(or white)... So the 3rd one will be either black or white... And match the 1st or 2nd sock....]!!!
At a family reunion were the following people: one grandfather, one grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one father-in-law, one mother-in-law, and one daughter-in-law. But not as many people attended as it sounds. How many were there, and who were they?
Ans. 7 (grandfather, grandmother, father, mother, 2 sons, 1 daughter)!
Isaac and Albert were excitedly describing the result of the Third Annual International Science Fair Extravaganza in Sweden. There were three contestants, Louis, Rene, and Johannes. Isaac reported that Louis won the fair, while Rene came in second. Albert, on the other hand, reported that Johannes won the fair, while Louis came in second.
In fact, neither Isaac nor Albert had given a correct report of the results of the science fair. Each of them had given one correct statement and one false statement. What was the actual placing of the three?
Ans. 1) Johannes 2) Rene 3) Louis
A man is d owner of a winery who recently passed away. In his will, he left 21 barrels (of which 7 r filled wid wine, 7 half full, nd 7 empty) 2 his 3 sons. However, d wine nd barrels must be split so dat each son has d same no. of full barrels, the same no. of half-full barrels nd d same no. of empty barrels. Note dat there r no measuring devices handy. How can d barrels nd wine b evenly divided?
Ans. 2 half-full barrels are dumped into one of d empty barrels. 2 more half-full barrels r dumped into another one of d empty barrels. This results in 9 full barrels, 3 half-full barrels, and 9 empty barrels. Each son gets 3 full barrels, 1 half-full barrel, and 3 empty barrels!!
A train leaves from New York City heading toward Los Angeles at 100 mph. Three hours later, a train leaves from Los Angeles heading toward New York City at 200 mph. Assume there's exactly 2000 miles between Los Angeles and New York City. When they meet, which train is closer to New York City?
Ans. Both will be at equal distance!! ;)