The Engineering Daily » Brain Teasers http://www.engineeringdaily.net Relevant News and Notes for Engineering Professionals Fri, 03 Feb 2012 20:47:21 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Brain Teaser: Fill in the Blanks http://www.engineeringdaily.net/brain-teaser-fill-in-the-blanks/ http://www.engineeringdaily.net/brain-teaser-fill-in-the-blanks/#comments Mon, 07 Nov 2011 15:53:16 +0000 admin http://www.engineeringdaily.net/?p=4164
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    • ]]>     Four words with the letters SNT, in that order, have all their other letters removed. You must use the letters below to fill in the blanks.
    _ _ S _ N T _ _ _
    S _ _ N T
    S _ N _ _ T
    S _ _ _ N T
    Letters to use: A, A, E, E, E, I, I, L, L, Q, S, S, U, U

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    ]]>     http://www.engineeringdaily.net/brain-teaser-fill-in-the-blanks/feed/ 1     Brain Teaser: A Sliding Ladder http://www.engineeringdaily.net/brain-teaser-a-sliding-ladder/ http://www.engineeringdaily.net/brain-teaser-a-sliding-ladder/#comments Mon, 07 Nov 2011 15:46:19 +0000 admin http://www.engineeringdaily.net/?p=4159
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    • ]]>     A 25 ft ladder (assume it is not an extension ladder) is placed with its foot 7 ft away from a building. If the top of the ladder slips down 4 ft, how many feet will the bottom slide out?

    A distribution manager’s dilemma | Back – Next | Fill in the Blanks

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    ]]>     http://www.engineeringdaily.net/brain-teaser-a-sliding-ladder/feed/ 10     Brain teaser – A distribution manager’s dilemma http://www.engineeringdaily.net/brain-teaser-a-distribution-managers-dilemma/ http://www.engineeringdaily.net/brain-teaser-a-distribution-managers-dilemma/#comments Mon, 22 Mar 2010 08:41:09 +0000 Doug Fred E.I. http://www.engineeringdaily.net/?p=3776
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    • ]]>     John the distribution manager for a leading mobile phone company has a dilemma. The warehouse has 10 unlabelled rows of pallets, each row contains thousands of phones destined for different countries. Each 100g mobile phone is exactly the same except for those in the row destined for Japan, which have a “special” 2g chip encased within the phone to make sure they work on the Japanese networks.

    All the trucks are waiting outside ready to go their separate ways, how can John make sure the right phones go to Japan in the quickest time possible? All John has at his disposal is a digital balance.

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    ]]>     http://www.engineeringdaily.net/brain-teaser-a-distribution-managers-dilemma/feed/ 4     Brain Teaser – Determine the code to open the briefcase http://www.engineeringdaily.net/brain-teaser-determine-the-code-to-open-the-briefcase/ http://www.engineeringdaily.net/brain-teaser-determine-the-code-to-open-the-briefcase/#comments Sat, 23 Jan 2010 20:58:26 +0000 Treesha James PE http://www.engineeringdaily.net/?p=3509
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    • ]]>     Doug had forgotten the 5 digit code to his briefcase. However, he did remember five clues:

    1. The fifth number plus the third number equals fourteen;
    2. The fourth number is one more than the second number;
    3. The first number is one less than twice the second number;
    4. The second number plus the third number equals ten; and
    5. The sum of all five numbers is 30.

    What were the five numbers and in what order?

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    ]]>     http://www.engineeringdaily.net/brain-teaser-determine-the-code-to-open-the-briefcase/feed/ 4     The Raffle Tickets Brain Teaser http://www.engineeringdaily.net/the-raffle-tickets-brain-teaser/ http://www.engineeringdaily.net/the-raffle-tickets-brain-teaser/#comments Thu, 01 Oct 2009 18:19:47 +0000 Ken.Kabaki http://www.engineeringdaily.net/?p=2332
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    • ]]>     Three girls at the school fair were each buying a raffle ticket.
    The only unsold tickets were numbered 4,6,9,21 and 26.

    After their three purchases were completed, their friend Tom noted that -

    1. The total of the three numbers was not a prime number.
    2. The total was not divisible by 17.
    3. Bernie did not have the largest number of the three
    4. Bernie did not have the smallest number of the three.
    5. One of their tickets was no 4
    6. The total of the three ticket numbers was not a square number
    7. Bernie’s ticket had an even number
    8. The number chosen by Carol would divide exactly into the product of the numbers chosen by Anne and Bernie

    Unfortunately, only THREE of Tom’s eight statements are true.

    What were the numbers of each of the girls’ tickets?

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    ]]>     http://www.engineeringdaily.net/the-raffle-tickets-brain-teaser/feed/ 0     Challenge your brain – Boys vs. Girls jigsaw puzzle http://www.engineeringdaily.net/challenge-your-brain-boys-vs-girls-jigsaw-puzzle/ http://www.engineeringdaily.net/challenge-your-brain-boys-vs-girls-jigsaw-puzzle/#comments Thu, 03 Sep 2009 22:54:24 +0000 Doug Fred E.I. http://www.engineeringdaily.net/?p=2150
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    • ]]>     jigsaw-puzzle-brain-teaserA team of 6 girls and 4 boys put together a 2200-piece jigsaw puzzle in 4 hours. The same jigsaw puzzle was put together in 8 hours by a team of two girls and five boys.

    Who are better at putting jigsaw puzzles together, boys or girls, and by how much?

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    ]]>     http://www.engineeringdaily.net/challenge-your-brain-boys-vs-girls-jigsaw-puzzle/feed/ 6     Brain teaser – Make this equation true, 999999999999999 = 1990 http://www.engineeringdaily.net/brain-teaser-make-this-equation-true/ http://www.engineeringdaily.net/brain-teaser-make-this-equation-true/#comments Thu, 20 Aug 2009 13:41:18 +0000 Ken.Kabaki http://www.engineeringdaily.net/?p=2049
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    • ]]>     Insert +, -, x or / in suitable places on the left side of = so as to make the equation true:

    999999999999999 = 1990

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    Cross a rickety bridge in 17 minutes | Back – Next | Challenge your brain – Boys vs. Girls jigsaw puzzle

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    ]]>     http://www.engineeringdaily.net/brain-teaser-make-this-equation-true/feed/ 4     Cross a Rope Bridge in 17 minutes http://www.engineeringdaily.net/cross-a-rope-bridge-in-17-minutes/ http://www.engineeringdaily.net/cross-a-rope-bridge-in-17-minutes/#comments Mon, 10 Aug 2009 22:53:53 +0000 Doug Fred E.I. http://www.engineeringdaily.net/?p=1952
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    • ]]>     rope-bridgeFour people need to cross a rickety rope bridge to get back to their camp at night. Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time.
    Each of the campers walks at a different speed. One can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the slow poke takes 10 minutes to cross. How do the campers make it across in 17 minutes?

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    ]]>     http://www.engineeringdaily.net/cross-a-rope-bridge-in-17-minutes/feed/ 5     Which of the following best expresses the main conclusion of the given argument http://www.engineeringdaily.net/which-of-the-following-best-expresses-the-main-conclusion-of-the-argument-above/ http://www.engineeringdaily.net/which-of-the-following-best-expresses-the-main-conclusion-of-the-argument-above/#comments Thu, 30 Jul 2009 14:17:40 +0000 Ken.Kabaki http://www.engineeringdaily.net/?p=1832
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    • ]]>     No electoral system will ever produce the right leaders. From ancient times it has been recognized that the kind of people with the qualities needed to win high office have, by the same token, measures of personal ambition and single-mindedness quite undesirable in a responsible leader. Conversely those with less dubious virtues, such as humility and an open mind, would neither emerge as leaders nor survive as leaders under a selection system that is so inherently competitive.

    Which of the following best expresses the main conclusion of the argument above?

    A. Personal ambition and single-mindedness are necessary in a leader.
    B. Humility and open-mindedness are not electoral assets.
    C. People who win elections are never the right leaders.
    D. Humble and open-minded individuals are desirable as leaders.
    E. What is wrong with the electoral system is its competitiveness.

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    Justify the fear of spiders | Back – Next | Cross a rope bridge in 17 minutes…

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    ]]>     http://www.engineeringdaily.net/which-of-the-following-best-expresses-the-main-conclusion-of-the-argument-above/feed/ 5     Determine which of the following is an underlying assumption of the above argument http://www.engineeringdaily.net/determine-which-of-the-following-is-an-underlying-assumption-of-the-above-argument/ http://www.engineeringdaily.net/determine-which-of-the-following-is-an-underlying-assumption-of-the-above-argument/#comments Mon, 20 Jul 2009 16:29:58 +0000 Doug Fred E.I. http://www.engineeringdaily.net/?p=1750
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    • ]]>     A fear of spiders could be justified in that the bite of all spiders is to some extent venomous.

    However, we need to put this justification into perspective.In the United States, which has more than its fair share of hard-biting spiders, only three people die from spider bites each year and they are usually small children or the frail elderly.

    Furthermore, a good rule is that if a spider spins a web, as all British spiders do, its jaws are unlikely to be strong enough to penetrate human skin.  Even when a web spider does bite humans, its venom is unlikely to be dangerous.  Clearly people in Britain have no good reason to fear spiders.

    Which one of the following is an underlying assumption of the above argument?

    A.Very few British spiders have a venomous bite.
    B.Most people in Britain are unlikely to be afraid of spiders.
    C.Most spiders that do not spin webs can bite through human skin.
    D.The only way in which spiders can harm people is by biting them.
    E.It is only very small children and the frail elderly who are affected by the venom of spiders.

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    Solve this equality | Back – Next | No electoral process will ever produce the right leaders?

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    ]]>     http://www.engineeringdaily.net/determine-which-of-the-following-is-an-underlying-assumption-of-the-above-argument/feed/ 7     Brain Teaser – Rectify this equality http://www.engineeringdaily.net/brain-teaser-rectify-this-equality/ http://www.engineeringdaily.net/brain-teaser-rectify-this-equality/#comments Tue, 07 Jul 2009 18:26:21 +0000 Doug Fred E.I. http://www.engineeringdaily.net/?p=1618
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    • ]]>     Rectify the following equality.

    101 – 102 = 1

    By moving only one digit.

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    How long did Christopher live | Back – Next | Analyze this statement

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    ]]>     http://www.engineeringdaily.net/brain-teaser-rectify-this-equality/feed/ 0     Brain Teaser – How long did Christopher live? http://www.engineeringdaily.net/brain-teaser-how-long-did-christopher-live/ http://www.engineeringdaily.net/brain-teaser-how-long-did-christopher-live/#comments Sun, 28 Jun 2009 05:40:55 +0000 Ken.Kabaki http://www.engineeringdaily.net/?p=1524
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    • ]]>     Christopher’s youth lasted 1/6 of his life. He had his first beard in the next 1/12 of his life. At the end of the following 1/7 of his life Christopher got married. Five years from then his son was born. His son lived exactly 1/2 of Christopher’s life. Christopher died 4 years after the death of his son. How long did Christopher live?

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    ]]>     http://www.engineeringdaily.net/brain-teaser-how-long-did-christopher-live/feed/ 8     Brain game – weighing 24 coins http://www.engineeringdaily.net/brain-game-weighing-24-coins/ http://www.engineeringdaily.net/brain-game-weighing-24-coins/#comments Tue, 16 Jun 2009 04:10:36 +0000 Doug Fred E.I. http://www.engineeringdaily.net/?p=1438
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    • ]]>     scale1You have 24 coins. 23 coins are the same weight, but 1 coin is either heavier or lighter. All you are given is a set of BALANCE scales, which can compare the weight of any two sets of coins out of the total set of 24 coins.

    What is the minimum number of weighings required to identify the coin, and why?

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    Can you figure out what is odd about this paragraph? | Back – Next | How long did Christopher live?

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    ]]>     http://www.engineeringdaily.net/brain-game-weighing-24-coins/feed/ 19     Arrange the numbers 1-9 in a 3×3 square using each only once http://www.engineeringdaily.net/brain-game-to-arrange-the-numbers-1-9-in-a-3x3-square-using-each-once-only/ http://www.engineeringdaily.net/brain-game-to-arrange-the-numbers-1-9-in-a-3x3-square-using-each-once-only/#comments Thu, 28 May 2009 17:41:13 +0000 Doug Fred E.I. http://www.engineeringdaily.net/?p=1148
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    • ]]>
    Brain Teaser for Engineers

    Arrange the numbers 1-9 in a 3×3 square using each once only, according to the following rules:

    • exactly one prime number is directly above a prime number that’s two numbers less;
    • each pair of opposite corners sums to the same square total and exactly two columns share another square total;
    • exactly one prime number is directly to the left of a non-prime number that’s two numbers greater;
    • directly above exactly one square number is a number that’s four numbers greater; and
    • directly to the right of exactly one cubic number is a number that’s one number greater.

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    Two Sand Glasses | Back – Next | An unusual paragraph

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    ]]>     http://www.engineeringdaily.net/brain-game-to-arrange-the-numbers-1-9-in-a-3x3-square-using-each-once-only/feed/ 8     Two sand glasses – Brain Teaser http://www.engineeringdaily.net/two-sand-glasses/ http://www.engineeringdaily.net/two-sand-glasses/#comments Mon, 18 May 2009 03:42:12 +0000 Ken.Kabaki http://www.engineeringdaily.net/?p=1049
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    • ]]>     hour_glass_1What is the quickest way to time a 9 minute cooking session with two sand-glasses of 4 and 7 minutes respectively?

    Post your answer and calculations below.

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    A riddle to challenge your mind | Back – Next | Arrange the numbers 1-9

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