Author Topic: Riddles!  (Read 29737 times)

Online CountValentine

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Re: Riddles!
« Reply #345 on: September 04, 2019, 04:37:01 PM »
If you want a much harder riddle try the same thing with 12 marbles. You still need to determine whether the odd one is heavier or lighter and you still get only 3 weighings.
So it is harder to google the answer for 12 than 9?  :)
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Offline aygart

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Re: Riddles!
« Reply #346 on: September 04, 2019, 04:42:09 PM »
You need to figure out if the odd one is heavier or lighter
I missed that.
The thing with the hamster is that running on the wheel is actually what it is trying to do.

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Re: Riddles!
« Reply #347 on: September 04, 2019, 04:42:56 PM »
I missed that.
So did I and that is why I said 4/4.
You're so far up Trump's a** you can see Giuliani's feet.  HT Baruch

Offline Yonah

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Re: Riddles!
« Reply #348 on: September 04, 2019, 06:08:07 PM »
An oldie but Goodie:

In front of you are 9 marbles and a balance (a scale that has two sides where you can weigh one side against the other). The marbles are all of identical size, and 8 of the 9 have an identical weight.

Using the balance, you need to find the odd-weight marble, and identify if it is heavier or lighter than the other 8 - but you can only use the balance 3 times.

How do you do it?

The solution, succinctly:

1. Split the 9 marbles into 3 groups of 3, call them A,B, and C
2. Weigh A vs B
3a. If A = B, the odd marble is in group C, Then weigh the three marbles in the group against each other, two will be equal, and you will know which is the odd one out, and if it's lighter or heavier.
3b. If A > B, then weigh A vs C; If A > C, you know that group A contains the marble, and it's heavier.  If A = C, then group B contains the Marble and you know that the odd marble is lighter.
4. (Only if A<>B) - weigh two of the marbles in the "Odd" group, if they're equal, you know that the third marble is the odd one, and you've already established if it's lighter or heavier. If they're not equal, then the one on the side you've established is the odd one out.



Offline yossig

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Re: Riddles!
« Reply #349 on: September 04, 2019, 08:59:12 PM »
Hereís a interesting one,

There was a king that wanted to refill his collection of gold, so he ordered from 10 different companies an order of 10 gold bricks each, each brick weighed 10 pounds.

Somehow he figured out that one company defrauded him and sent him 10 bricks that weighed only 9.9 pounds, though, they all looked and feel exactly the same and itís impossible to notice anything.

He wanted to challenge his Jewish financial advisor so he called him in and told him, listen, Iím giving you a digital scale and you can place how many bricks you want on it and I want you to tell me which company sent the lighter bricks,

but,
 you can only use the scale once

Can you help him?

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Re: Riddles!
« Reply #350 on: September 04, 2019, 09:12:39 PM »
Jewish financial adviser brings along 9 scales of his own. Problem solved!
Workflowy. You won't know what you're missing until you try it.

Offline yossig

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Re: Riddles!
« Reply #351 on: September 04, 2019, 09:25:33 PM »
Jewish financial adviser brings along 9 scales of his own. Problem solved!
you could do better then that ;)

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Re: Riddles!
« Reply #352 on: September 04, 2019, 09:29:16 PM »
you could do better than that ;)
Jewish financial adviser uses his extensive networking skills to make a friend in each company and get inside information on who was cheating the king.
Workflowy. You won't know what you're missing until you try it.

Offline AussieMan

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Re: Riddles!
« Reply #353 on: September 04, 2019, 09:52:25 PM »
but,
 you can only use the scale once

Can you help him?
What does use mean?
Can he put all Bricks on and Then take them off one at a time?

Offline lubaby

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Re: Riddles!
« Reply #354 on: September 04, 2019, 09:54:32 PM »
Hereís a interesting one,

There was a king that wanted to refill his collection of gold, so he ordered from 10 different companies an order of 10 gold bricks each, each brick weighed 10 pounds.

Somehow he figured out that one company defrauded him and sent him 10 bricks that weighed only 9.9 pounds, though, they all looked and feel exactly the same and itís impossible to notice anything.

He wanted to challenge his Jewish financial advisor so he called him in and told him, listen, Iím giving you a digital scale and you can place how many bricks you want on it and I want you to tell me which company sent the lighter bricks,

but,
 you can only use the scale once

Can you help him?
Scale is digital, so you need to turn it on first at 0 and then add bricks to get weight.
So yes, you can only use it once, but itís already on. And since gold bricks are heavy (even if only 10 pounds), you start stacking them on top of each other on the ďonĒ scale. As soon as the weight is off you have your answer.
Once the game is over, the king and the pawn go back in the same box.

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Re: Riddles!
« Reply #355 on: September 04, 2019, 10:01:19 PM »
How much weight can the scale hold?
This will be easier if you keep the bricks grouped by supplier until this is done.
Workflowy. You won't know what you're missing until you try it.

Offline bubbles

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Re: Riddles!
« Reply #356 on: September 04, 2019, 10:09:33 PM »
Put 1 from the first company 2 from the second etc and then see the final decimal reading

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Re: Riddles!
« Reply #357 on: September 04, 2019, 11:30:52 PM »
If you want a much harder riddle try the same thing with 12 marbles. You still need to determine whether the odd one is heavier or lighter and you still get only 3 weighings.
Oh actually I think this is the version we did in 11th grade
Jack of all trades, master of none.

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Re: Riddles!
« Reply #358 on: September 04, 2019, 11:38:57 PM »
Put 1 from the first company 2 from the second etc and then see the final decimal reading

+1 I got the same answer

Offline yossig

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Re: Riddles!
« Reply #359 on: September 05, 2019, 09:38:48 AM »
Put 1 from the first company 2 from the second etc and then see the final decimal reading
this is the correct answer, and you put them all on together
« Last Edit: September 05, 2019, 11:34:32 AM by yossig »