Monday, May 25, 2009

Lots Of Bags and Sugar

You have 24 kg of sugar. You have a lot of bags. You have a scale but no weights. How do you measure 4.5 kg of sugar?

Asked by BloggerIO.


  1. Use the scales to:
    1. Halve the sugar into 12 kg (A) and 12 kg (B).
    2. Halve the 12 kg (A) into 6kg and 6kg.
    3. Add 6 kg to the 12 kg (B) from step 1 to get 18 kg.
    4. Halve the 18 kg to get 9 kg.
    5. Halve the 9 kg to get 4.5 kg.

  2. 1/ divide by 4 = 6 x 4.
    2/ halve one of the 6's = 3 put to one side for later
    3/ halve the other 3 and add to the saved 3 = 4.5

  3. Or you can ...

    half it once .. 12 kg (A) - 12 kg (B)

    half (A) forget (B) .. 6 kg (C) - 6 kg (D)

    half (C) forget (D) .. 3 kg (E) - 3 kg (F)

    half (E) put aside (F) .. 1.5 kg (G) - 1.5 kg (H)

    Put the sugar from (G) in (F) and you get 1.5 kg + 3 kg = 4.5 kg


  4. hi thanks for posting it. Pvt.Leth has the most right answer i will send you more questions

  5. Horse Race
    A king had two sons. The king was getting very old and he didnt know who to give his kingdom to. So he got his sons together for a horse race. He said Whoevers horse crosses the finish line last gets my kingdom. So they both started out very slow until they came to a man on the side of the road. He asked why they were riding so slow. They told him their story and the man gave them two words of advice. After hearing these words they took off as fast as they could. What were the two words of advice?

    another one

  6. Boxing Match
    Two boxers are in a boxing match (regular boxing not kick boxing). The fight is scheduled for 12 rounds but ends after 6 rounds after one boxer knocks out the other boxer. Yet no man throws a punch. How is this possible?

    and another one

  7. You wake up to find yourself naked in a bare room... There is a pipe about waist high sticking up out of the concrete floor and a note... the note reads... If you want to get out remove the ping pong ball from this pipe You notice you cannot fit your hand inside the pipe but look into it and see a ping pong ball at the bottom... How do you get it out?

    and another one

  8. Hi, not much into Mathematics myself but my husband is. Your site is nice. I added your link on mine. thanks

  9. man lives on floor 24 of a tower block. Every day he takes the lift down to go to work. When he comes home he takes the lift up to floor 20 but walks the rest of the way to 24. But when its raining he takes the lift straight to room 24. Why does he do this?

    is this too much for you

  10. can you add me as administrator so i can

  11. A prisoner is told If you tell a lie we will hang you; if you tell the truth we will shoot you. What can he say to save himself?

    man i'm good

  12. This is way over my head, but thanks for making me think!

  13. Hey BloggerIO,
    Send me an e-mail and we can talk about it. You can see it in the about section.

    I've posted a few of these questions before, but I'll be more than happy to post the new ones.

  14. @BloggerIO: The answer to the first one is "switch horses".

  15. Also, the elevator man is a midget and when it's raining he can use his umbrella to push a higher button.
    And the prisoner should probably say nothing if he wants to live, I think.

  16. I can only think of dividing bags until you reach 1.5kg per bag, where you can add 3 bags together to get 4.5kg.

    I would like to know if there was alternate answer =)

  17. The prisoner answer would be to tell an opinion. It's not a lie or the truth.

  18. This comment has been removed by a blog administrator.

  19. The answers to BloggerIO's remaining questions are:

    1. The 2 boxers are women.

    2. Invert the pipe and take out the ball from the other side.

    Do correct me if I am wrong.

  20. Love the site. Wondering if you could make each riddle its own post instead of an embedded comment.

  21. The prisoner should say: "I will die by hanging."

  22. Jered,
    Glad you like it. The official question is its own post, but the readers are quizzing each other in the comments. I think it's great!

    But if a new question gets asked in the comments (which is harder than it looks since there are over 950 'questions' so far) I pull them out and place them as their own question so everyone can see.

    If you have a question you don't think I've asked before, send me an e-mail and I'll post it.

  23. hey guys
    1.Switch horses
    2.they are women
    3.hes to short only with umbrela when it rains
    4.he said you will hang me

    great site

  24. This comment has been removed by the author.

  25. Okay, so u know the ping pong ball on?
    right, since it's a concrete floor, and it's mid-waist, I think the person should probably blow into the pipe so that the ball can GET OUT from the other side ... it's either that or it was a trick question since the room was bare ..

    Do correct me if i'm wrong

  26. ---about the pingpong question...

    ---pour water inside and fill the pipe..

    ---since the ball will float..

    ---u can get it..i think?..

    ---this is just a guess though..^^


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