Riddle: You have 10 bags...

[Brian23]

Another solution: Look for the bag with smaller coins in it.

 

[jagec]

Originally posted by: Brian23
Another solution: Look for the bag with smaller coins in it.

I was just about to post that

 

[crt1530]

You should really post that all the coins in a given bag are uniform in mass.

 

[Triumph]

Originally posted by: ndee
Solution as some have found:

Weigh one coin from the first bag, two coins from the second bag, three coins from the third bag, etc.
100 times the difference from 55 grams is the bag that weighs 99 grams.

copyright by chuckywang

um, that's more than one weighing.

 

[silverpig]

Here's a tough one that took me a few hours to work through. Please don't post spoilers for the people who want to solve it

You have 12 golf balls, 11 of the same weight and one of a deviating weight. You are allowed to use a balance scale 3 times. BUT, you do not know whether the deviating golf ball is heavier or lighter than the rest. Using the scale 3 times, you have to point out the deviating ball AND tell whether its heavier or lighter than the rest.

 

[jagec]

Originally posted by: Triumph

Originally posted by: ndee
Solution as some have found:

Weigh one coin from the first bag, two coins from the second bag, three coins from the third bag, etc.
100 times the difference from 55 grams is the bag that weighs 99 grams.

copyright by chuckywang

um, that's more than one weighing.

No it isn't...you weigh them all at once.

 

[Dessert Tears]

Originally posted by: ndee
Solution as some have found:

Weigh one coin from the first bag, two coins from the second bag, three coins from the third bag, etc.
100 times the difference from 55 grams is the bag that weighs 99 grams.

copyright by chuckywang

You can use 10 fewer coins.

 

[moshquerade]

Originally posted by: ndee
You have one scale and 10 bags with 100 coins each. 9 bags weigh 100g (gramms), 1 bag weighs 99g. With only one weighing, you have to find the bag which weighs 99g. How would you do it? Remember, you may use the scale only once. For example, you cannot put the first bag on the scale, read the weight, put the second one on the scale, read the weight, etc.
If you have the solution, please don't post it. If you have questions, just ask

BTW: Took me 20 minutes

it took you longer than that ndee :thumbsup:

 

[GoingUp]

Originally posted by: silverpig
Here's a tough one that took me a few hours to work through. Please don't post spoilers for the people who want to solve it

You have 12 golf balls, 11 of the same weight and one of a deviating weight. You are allowed to use a balance scale 3 times. BUT, you do not know whether the deviating golf ball is heavier or lighter than the rest. Using the scale 3 times, you have to point out the deviating ball AND tell whether its heavier or lighter than the rest.

Thats so frickin easy.

 

[bondboy]

Originally posted by: Gobadgrs

Originally posted by: silverpig
Here's a tough one that took me a few hours to work through. Please don't post spoilers for the people who want to solve it

You have 12 golf balls, 11 of the same weight and one of a deviating weight. You are allowed to use a balance scale 3 times. BUT, you do not know whether the deviating golf ball is heavier or lighter than the rest. Using the scale 3 times, you have to point out the deviating ball AND tell whether its heavier or lighter than the rest.

Thats so frickin easy.

Yea this one was actually easier.

 

[sniperruff]

Originally posted by: bondboy

Originally posted by: Gobadgrs

Originally posted by: silverpig
Here's a tough one that took me a few hours to work through. Please don't post spoilers for the people who want to solve it

You have 12 golf balls, 11 of the same weight and one of a deviating weight. You are allowed to use a balance scale 3 times. BUT, you do not know whether the deviating golf ball is heavier or lighter than the rest. Using the scale 3 times, you have to point out the deviating ball AND tell whether its heavier or lighter than the rest.

Thats so frickin easy.

Yea this one was actually easier.

i feel insulted. this is like a 3rd grade problem!

 

[MrCodeDude]

I don't get why you can only use the scale once? I mean, if I have a scale, I'll use it as many damn times as I please.

 

[chuckywang]

Originally posted by: sniperruff

Originally posted by: bondboy

Originally posted by: Gobadgrs

Originally posted by: silverpig
Here's a tough one that took me a few hours to work through. Please don't post spoilers for the people who want to solve it

You have 12 golf balls, 11 of the same weight and one of a deviating weight. You are allowed to use a balance scale 3 times. BUT, you do not know whether the deviating golf ball is heavier or lighter than the rest. Using the scale 3 times, you have to point out the deviating ball AND tell whether its heavier or lighter than the rest.

Thats so frickin easy.

Yea this one was actually easier.

i feel insulted. this is like a 3rd grade problem!

I got it....I think it's about the same level as the OP's riddle. So what's your answer?

 

[ndee]

Originally posted by: Triumph

Originally posted by: ndee
Solution as some have found:

Weigh one coin from the first bag, two coins from the second bag, three coins from the third bag, etc.
100 times the difference from 55 grams is the bag that weighs 99 grams.

copyright by chuckywang

um, that's more than one weighing.

ah, it was already late. Ok, here's the real solution:

Take 1 coin from the first bag, 2 coins from the second, 3 coins from the third, etc. Then, put them all together on the scale -> with that difference to 55, you find out which bag weighs 99g.

or yeah, you weigh them all at once, I think that's what chuckywang meant.

 

[mjrpes3]

It needs to be clarified in the riddle that all the coins in a bag weigh the same.

That threw me off.

 

[xSauronx]

Originally posted by: MrCodeDude
I don't get why you can only use the scale once? I mean, if I have a scale, I'll use it as many damn times as I please.

i agree, i hate silly questions like this that limit you just because....like the 3 kids with a boat. the boat could hold 90lbs, and the kids weighed 30, 60, and 90lbs respectively...

the teacher didnt like it when i told her that the smaller ones would get in the boat, and the larger one would hold on and swim across with them; said it wasnt logical, neither was 2 using the boat and 1 using a bridge.

whats not logical is some asshat parents buying their 3 kids a boat that they cant all use at the same time. i hate parents like that.

 

[DingDingDao]

Originally posted by: xSauronx

Originally posted by: MrCodeDude
I don't get why you can only use the scale once? I mean, if I have a scale, I'll use it as many damn times as I please.

i agree, i hate silly questions like this that limit you just because....like the 3 kids with a boat. the boat could hold 90lbs, and the kids weighed 30, 60, and 90lbs respectively...

the teacher didnt like it when i told her that the smaller ones would get in the boat, and the larger one would hold on and swim across with them; said it wasnt logical, neither was 2 using the boat and 1 using a bridge.

whats not logical is some asshat parents buying their 3 kids a boat that they cant all use at the same time. i hate parents like that.

:laugh: Best rant I've seen in a while :beer:

 

[nCred]

Originally posted by: sniperruff

Originally posted by: bondboy

Originally posted by: Gobadgrs

Originally posted by: silverpig
Here's a tough one that took me a few hours to work through. Please don't post spoilers for the people who want to solve it

You have 12 golf balls, 11 of the same weight and one of a deviating weight. You are allowed to use a balance scale 3 times. BUT, you do not know whether the deviating golf ball is heavier or lighter than the rest. Using the scale 3 times, you have to point out the deviating ball AND tell whether its heavier or lighter than the rest.

Thats so frickin easy.

Yea this one was actually easier.

i feel insulted. this is like a 3rd grade problem!

What´s the answer?

 

[chuckywang]

Originally posted by: nCred

Originally posted by: sniperruff

Originally posted by: bondboy

Originally posted by: Gobadgrs

Originally posted by: silverpig
Here's a tough one that took me a few hours to work through. Please don't post spoilers for the people who want to solve it

You have 12 golf balls, 11 of the same weight and one of a deviating weight. You are allowed to use a balance scale 3 times. BUT, you do not know whether the deviating golf ball is heavier or lighter than the rest. Using the scale 3 times, you have to point out the deviating ball AND tell whether its heavier or lighter than the rest.

Thats so frickin easy.

Yea this one was actually easier.

i feel insulted. this is like a 3rd grade problem!

What´s the answer?

Somebody post the answer already! I got it, but I want to see what other people think.

 

[Engineer]

Give me all 10 bags of coins and I don't care if you weigh them or not.

 

[Dessert Tears]

Originally posted by: chuckywang
Somebody post the answer already! I got it, but I want to see what other people think.

I was able to find something on a physics forum with Google. Think it was "12 red [something] balls". The given mathematician/"systematic" solution (you'll see what I mean when you read it) actually has an error - balls 9 and 12 are indistinguishable.

http://www.physicsforums.com/archive/topic/t-40405_12_red_snooker_balls.html

I think that thread will provide validation - the problem isn't as easy as the early posts would indicate.

 

[Chaotic42]

Originally posted by: ndee
Solution as some have found:

Weigh one coin from the first bag, two coins from the second bag, three coins from the third bag, etc.
100 times the difference from 55 grams is the bag that weighs 99 grams.

copyright by chuckywang

Been watching Columbo?

 

[chuckywang]

Originally posted by: Chaotic42

Originally posted by: ndee
Solution as some have found:

Weigh one coin from the first bag, two coins from the second bag, three coins from the third bag, etc.
100 times the difference from 55 grams is the bag that weighs 99 grams.

copyright by chuckywang

Been watching Columbo?

Uh...yes. But that show didn't help me solve this riddle.

 

[Chaotic42]

Originally posted by: chuckywang
Uh...yes. But that show didn't help me solve this riddle.

I'm just kidding around. There's an episode with this riddle in it.

 

[FFactory0x]

Originally posted by: b0mbrman
Just pick them up and feel which one's the lightest...idiot :roll:

j/k

[Edit] Oh, and I got it

hahahahaha