Logic Riddle
Weighing The Gold
You have 15 tiny gold bars and a balance scale. One of the bars is lighter than the others, but you can't tell the difference by feel. What is least number of times you could use the scale to determine which one is the light one?
popcorn anyone?
Similar Threads:Other Threads:
Hello Miss Snow,
If I'm lucky, I would need to use it once. Otherwise, 3 times would guarantee me the answer.
Method 1:
Weigh 7-7 bars.
case 1: If they are equal, the 15th bar is the answer.
case 2: If they are not equal, weigh 3-3 of the lighter one.
case 2-1: If they are equal, the 3th bar is the answer.
case 2-2: If they are not, weigh 1-1 for the ligher one.
Method 2:
Weigh 4-4 bars.
case 1: If they are equal, weigh 3-3 of the remain 7 bars
case 1-1: if they are equal, the 7th bars is the answer
case 1-2: if they are not equal, weigh 1-1 for the lighter one.
case 2: if they are not equal, weigh 2-2 of the lighter one then weigh 1-1 for the ligher one.
Wow... Handsome those braincells must had been working very hard in the last several days or you were just born handsome... opse i meant smart..
let's tease those braincells one more time with this riddle
You are being convicted, and you get the death penalty. The judge allows you to say a last sentence in order to determine the way the penalty will be carried out. If you lie, you will be hanged, if you speak the truth you will be beheaded. you speak a last sentence and to everybody surprise some minutes later you are set free because the judge cannot determine your penalty.
What will you say?
Deep down inside, I was cursing my lawyer, but being nice and polite, I didn't say it out loud.
I also remembered that my mom told me to always be neat and clean, and the image of my head rolling around the execution courtyard wasn't very appealing. There was no way that I let myself beheaded. I quietly asked the judge to do me a big favor and just hang me.
While the judge was making up his mind, I went back to my cell, preparing to say good bye to the living world. As for my last meal, I ordered a nice juicy ribeye steak with a delicious piece of cheese cake.
I kept waiting for hours for my meal, but it didn't come. I thought they would hang me hungry. Oh well, no big deal, I guess. I wouldn't be hungry for long, anyway. I decided to take a short nap, hoping to catch a nice dream before I went bye bye.
A sound of squeaky metal door woke me up. I opened my eyes, feeling a bit upset that the dream hadn't been completed. Standing at the door were two prison guards, who were pulling a chain and unlocking the door to my cell. One of them told me that I was free. The judge couldn't make up his mind to whether hang or behead me.
I guess the judge was thinking that if he hanged me, then I spoke the truth. In which case, he was supposed to behead me.
Now, if he beheaded me, then I lied. In which case, he was supposed to hang me.
After banging his head to the wall about one thousand two hundred and fifty one times, he decided to let me go.
A female guard escorted me to the street and gave me a hug good bye. I walked off, wishing that I could continue the dream that I had during the earlier nap. After all, it wasn't every day that I could have such a nice juicy ribeye steak ...
Last edited by Handsome Bear; Nov 17, 2007 at 02:54 AM.
haha .. you must be a professional day dreamer, or else ... hahagreat answer. and thanks for such a valid picture you'd painted there. specially the banging of the judge's head to the wall about one thousand two hundred and fifty one times. haha
Canoeing
In a dream, which he wished he didn't have to wake up, Handsome Bear was going camping with Snow, Bamboo, and Blue Moon (yeah, dream on, Handsome). They got to a river and decided to cross it with a small canoe.
Snow, a certified expert in canoeing, could paddle across the river in 1 minute,
Bamboo could in 2 minutes,
Blue Moon could in 5 minutes, and
Handsome Bear, being “a man with a slow hand”, would need a whole 10 minutes to paddle across.
The rules said that the canoe could only carry one or two people at a time, and if there were two people in the canoe, only the slower person could paddle.
How did they get across the river in the fastest time without breaking the rule?
1.BBB paddles across with SnowDrop, and returns alone. (4 mins)Originally Posted by Handsome Bear
In a dream, which he wished he didn't have to wake up, Handsome Bear was going camping with Snow, Bamboo, and Blue Moon (yeah, dream on, Handsome
Snow, a certified expert in canoeing, could paddle across the river in 1 minute,
Bamboo could in 2 minutes,
Blue Moon could in 5 minutes, and
Handsome Bear, being “a man with a slow hand”, would need a whole 10 minutes to paddle across.
The rules said that the canoe could only carry one or two people at a time, and if there were two people in the canoe, only the slower person could paddle.
How did they get across the river in the fastest time without breaking the rule?
2.Mr Xau Trai paddles across with BlueMoon, and SnowDrop paddles back.(11 mins)
3.BBB then paddles back with SnowDrop. (2 mins)
===> The total is 17 minutes.
The point is that BlueMoon and Mr XauTrai had to "đi chung chuyến thứ 2" hehehe
Thay JK,
Technically, you didn't answer it right because the names you've used weren't in my dream. However, you have correctly arranged the "numbers". I couldn't come up with any other arrangements that were less than 17 minutes.
I'm highly impressed.
For those who wonder why the arrangement has got to be the way Mr. JK did, a logical way to arrange is to put the slowest couple together to paddle to the other side, and let the fastest person paddle back alone.
If you put a key in a narrow neck bottle and place a cork into the neck of the bottle, how could you remove the key without taking out the cork and not breaking the bottle?
Last edited by snowdrop_14; Dec 28, 2007 at 11:52 PM.
Hahahahaha This is easy. Push the cork into the bottle and shake the key out.
Quote
