ENGINEERING.com Puzzles
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Engineering Puzzlesen-USActiveForums 4.2Copyright 2000-2013 ENGINEERING.comThu, 26 Mar 2015 12:50:44 GMTThere are 12 coins. One of them is false; it weights differently. It is not known, if the false coin is heavier or lighter than the right coins. How to find the false coin by three weighs on a simple scale?There are 12 coins. One of them is false; it weights differently. It is not known, if the false coin is heavier or lighter than the right coins. How to find the false coin by three weighs on a simple scale?
http://www.engineering.com/AskForum/aff/38/aft/1882/afv/topic.aspx
balThu, 26 Mar 2015 12:50:44 GMThttp://www.engineering.com/AskForum/aff/38/aft/1882/afv/topic.aspx0What is the next number in the sequence? 1 11 21 1211 111221 312211What is the next number in the sequence? 1 11 21 1211 111221 312211
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alecWed, 25 Mar 2015 12:48:06 GMThttp://www.engineering.com/AskForum/aff/38/aft/1880/afv/topic.aspx1A claustrophobic person gets on a train. The train enters a tunnel just as it is leaving the station. Where is the best place for him to sit?A claustrophobic person gets on a train. The train enters a tunnel just as it is leaving the station. <br /> <br /> Where is the best place for him to sit?
http://www.engineering.com/AskForum/aff/38/aft/1879/afv/topic.aspx
richieWed, 25 Mar 2015 12:45:28 GMThttp://www.engineering.com/AskForum/aff/38/aft/1879/afv/topic.aspx1Right now Mum is 21 years older then her child In 6 years her child will be 5 times younger than she. Where is daddy?Right now Mum is 21 years older then her child In 6 years her child will be 5 times younger than she. Where is daddy?
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edu gasparThu, 05 Mar 2015 07:53:36 GMThttp://www.engineering.com/AskForum/aff/38/aft/1846/afv/topic.aspx3Smell me, buy me, and deliver me. I won't change. What am I?Smell me, buy me, and deliver me. <br /> I won't change. <br />
http://www.engineering.com/AskForum/aff/38/aft/1872/afv/topic.aspx
edu gasparSun, 22 Mar 2015 12:53:36 GMThttp://www.engineering.com/AskForum/aff/38/aft/1872/afv/topic.aspx2Who am I ?If it's information you seek, come and see me. <br /> If it's pairs of letters you need, I have consecutively three. <br />
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alastairSun, 22 Mar 2015 12:51:24 GMThttp://www.engineering.com/AskForum/aff/38/aft/1871/afv/topic.aspx2When things go wrong, what can you always count on?When things go wrong, what can you always count on? <br />
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balSun, 01 Mar 2015 17:26:02 GMThttp://www.engineering.com/AskForum/aff/38/aft/1837/afv/topic.aspx4Why 1 = 2Find the mistake in these mathematical equations. <br /> x = 2 <br /> x(x-1) = 2(x-1) <br /> x2-x = 2x-2 <br /> x2-2x = x-2 <br /> x(x-2) = x-2 <br /> x = 1
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richieWed, 18 Mar 2015 12:00:04 GMThttp://www.engineering.com/AskForum/aff/38/aft/1867/afv/topic.aspx2Let's play a game. If I went halfway to a town 60 km away at the speed of 30 km/hour, how fast do I have to go the rest of the way to have an average speed of 60 km/hour over the entire trip?Let's play a game. If I went halfway to a town 60 km away at the speed of 30 km/hour, how fast do I have to go the rest of the way to have an average speed of 60 km/hour over the entire trip?
http://www.engineering.com/AskForum/aff/38/aft/1866/afv/topic.aspx
alastairWed, 18 Mar 2015 11:58:44 GMThttp://www.engineering.com/AskForum/aff/38/aft/1866/afv/topic.aspx1Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?
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alecTue, 10 Mar 2015 00:33:49 GMThttp://www.engineering.com/AskForum/aff/38/aft/1852/afv/topic.aspx2What do you get if you add 3 to 300 five times?What do you get if you add 3 to 300 five times?
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jamesWed, 11 Mar 2015 00:06:30 GMThttp://www.engineering.com/AskForum/aff/38/aft/1854/afv/topic.aspx2What’s the easiest way to double your money?What’s the easiest way to double your money?
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alastairWed, 11 Mar 2015 23:08:55 GMThttp://www.engineering.com/AskForum/aff/38/aft/1855/afv/topic.aspx2Why is 6 afraid of 7?Why is 6 afraid of 7?
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alecSun, 15 Mar 2015 12:03:35 GMThttp://www.engineering.com/AskForum/aff/38/aft/1860/afv/topic.aspx2What goes up and never comes down?What goes up and never comes down?
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rajSun, 15 Mar 2015 12:02:53 GMThttp://www.engineering.com/AskForum/aff/38/aft/1859/afv/topic.aspx1What has a thumb and four fingers but is not alive?What has a thumb and four fingers but is not alive?
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rahul gopinathWed, 11 Mar 2015 23:11:53 GMThttp://www.engineering.com/AskForum/aff/38/aft/1856/afv/topic.aspx1I am an odd number. Take away one letter and I become even. What number am I?I am an odd number. Take away one letter and I become even. What number am I?
http://www.engineering.com/AskForum/aff/38/aft/1850/afv/topic.aspx
jamesSun, 08 Mar 2015 23:36:07 GMThttp://www.engineering.com/AskForum/aff/38/aft/1850/afv/topic.aspx1If the Manchester Quartet can play Beethoven's 9th Symphony in 12 minutes, how quickly can the Birmingham Trio play it?If the Manchester Quartet can play Beethoven's 9th Symphony in 12 minutes, how quickly can the Birmingham Trio play it?
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rajWed, 25 Feb 2015 23:53:01 GMThttp://www.engineering.com/AskForum/aff/38/aft/1835/afv/topic.aspx2Two fathers and two sons sat down to eat eggs for breakfast. They ate exactly three eggs, each person had an egg. The riddle is for you to explain howTwo fathers and two sons sat down to eat eggs for breakfast. They ate exactly three eggs, each person had an egg. The riddle is for you to explain how
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bruno ggggMon, 02 Mar 2015 17:48:43 GMThttp://www.engineering.com/AskForum/aff/38/aft/1842/afv/topic.aspx2What coin doubles in value when half is deducted?What coin doubles in value when half is deducted?
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richieSun, 01 Mar 2015 17:27:07 GMThttp://www.engineering.com/AskForum/aff/38/aft/1838/afv/topic.aspx2What is the smallest positive integer that leaves a remainder of 1 when divided by 2, remainder of 2 when divided by 3, a remainder of 3 when divided by 4, and so on up to a remainder of 9 when divided by 10?What is the smallest positive integer that leaves a remainder of 1 when divided by 2, remainder of 2 when divided by 3, a remainder of 3 when divided by 4, and so on up to a remainder of 9 when divided by 10?
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alecMon, 02 Mar 2015 02:44:36 GMThttp://www.engineering.com/AskForum/aff/38/aft/1840/afv/topic.aspx2