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Need some more good brain teasers

Discussion in 'General Discussion' started by Melon, 16 Feb 2006.

  1. Melon

    Associate

    Joined: 19 Nov 2005

    Posts: 68

    Location: Newcastle Under Lyme

    I keep passing these on to a colleague at work and she gets really wound up trying to work them out.

    So come on guys lets have some more good brainteasers.
     
  2. carvegio

    Wise Guy

    Joined: 23 Jun 2004

    Posts: 1,098

    Location: London

    You have a 17 Litre Jug and a 9 Litre Jug, how do you make 5 Litres? - Pretty easy

    In a "seven-eleven" (7-11) store, a customer selected four items to buy. The check-out clerk says that he multiplied the costs of the items and obtained exactly 7.11, the very name of the store! The customer calmly tells the clerk that the costs of the items should be added, not multiplied. The clerk then informs the customer that the correct total is also $7.11.

    What are the exact costs of the 4 items?

    This can be very hard if you don't spot the trick!

    You have 12 marbles, one of them is either heavier or lighter than the rest. In three weighs on a balance scale, you must determine which is the odd marble. How do you do this? - This is pretty long to answer, you need a very methodical approach
     
  3. shimy182

    Mobster

    Joined: 6 Sep 2005

    Posts: 3,814

    Location: Cambridge

    3 tourists walks in to a hotel and pays 30 quid all togather for 3 single rooms.(10quid a room)

    the manager soon realizes that they should of only be paying 25 quid all togather as there was a offer going on.

    so he gets the bell boy and gives him 5 quid to give to the 3 tourists.
    the bell boy gets it in 5 one pound coins, so decides to keep 2 quid as tip and gives a quid each to the tourists..

    so that means that the trourists spent 9 quid each as they all gave 10 quid and got back a quid.

    3x9 equals 27
    27 + 2 (the 2 quid the bell boy got as tip) equals 29 pounds..
    and it should be 30 pounds all together ... where did he missing quid go?
     
  4. Melon

    Associate

    Joined: 19 Nov 2005

    Posts: 68

    Location: Newcastle Under Lyme

    what are the correct prices of the 7.11 one
     
  5. carvegio

    Wise Guy

    Joined: 23 Jun 2004

    Posts: 1,098

    Location: London

    shimy182: You should be taking away 2 pounds from 27 and not adding it to get the total cost of £25 pounds :p

    Each of them originally pay 10 each, so 30, they get 1 pound back, so they spend 9*3 = 27, and the bell boy TOOK 2 pounds, which would of otherwise gone back to the customers, so they would of spent less than £9 each and this is then timed by 3 .. long sentence ... so you should subtract the 2 quid from 27 and not add it, it doesn't make sense to do this.
     
  6. carvegio

    Wise Guy

    Joined: 23 Jun 2004

    Posts: 1,098

    Location: London

    It hasn't been an hour since I posted, it deserves more effort than that!
     
  7. Spend_day

    Wise Guy

    Joined: 27 Jul 2005

    Posts: 1,152

    Location: Norfolk

    if a tree falls in the woods and theres on1 there to hear it does it make a sound

    sorry had to
     
  8. shimy182

    Mobster

    Joined: 6 Sep 2005

    Posts: 3,814

    Location: Cambridge

    you spoilt it for the others...
     
  9. Gilly

    Man of Honour

    Joined: 17 Oct 2002

    Posts: 95,526

    Location: I'm back baby!

    This was asked in the first brain teasers thread, and pretty much everyone in the world knows that one.
     
  10. Melon

    Associate

    Joined: 19 Nov 2005

    Posts: 68

    Location: Newcastle Under Lyme

    Ok so now tell what is the answer to the 7.11 one please.

    I have passed this on to a girl I know and she is pestering me to give her the answer. (I dont know either) lol
     
  11. Tru

    Mobster

    Joined: 18 Oct 2002

    Posts: 2,959

    Location: OcUK Peoples Champion

  12. Melon

    Associate

    Joined: 19 Nov 2005

    Posts: 68

    Location: Newcastle Under Lyme

    You could of explained it to me lol

    Just kidding thanks
     
  13. singist

    Mobster

    Joined: 18 Oct 2002

    Posts: 4,446

    Location: Student Hell Headingley

    could HAVE explained
    could HAVE explained
    could HAVE explained
    could HAVE explained
    could HAVE explained
    could HAVE explained

    kids today ......... now when I was at school ......
     
  14. ~J~

    Sgarrista

    Joined: 20 Oct 2003

    Posts: 7,558

    Location: London

    One of my old faves as a child...

    What has 4 legs, has 2 legs, has 3, but the more legs it has, the weaker it be?
     
  15. SourChipmunk

    Sgarrista

    Joined: 9 Nov 2003

    Posts: 9,477

    Location: The Motor City

    An older version of the riddle of the Sphinx, I believe.

     
  16. ~J~

    Sgarrista

    Joined: 20 Oct 2003

    Posts: 7,558

    Location: London

    100% correct, yes it is. Did a little project when I was 10 at my primary school and that was on the card on my paper-maché sphinx :D