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Anybody got any good riddles?

Meistro

Asi Shounk Nu Karaiyaan Muschaan Kundiyaan...
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2,065
I have one that bugged the hell out of me for like a week...............

"what wets and dries at the same time?"
 

kinnell

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2,159
Okay, I just got back from Peru and I drilled my 10 year old brother with REAL riddles. I mean the ones where you actually feel accomplished when you solve them yourself. :p Needless to say, my little brother became frustrated to the point where he actually bit my arm.

Here's the first one:

You have 12 balls. Identical except for the fact that one is a bit heavier than the others. You don't know which one. You have a 2 sided scale (you can put two things on both sides) and you can use it only 3 times. How do you find the heavier ball.

Don't look it up. Just think it out. I thought of a few variations for this problem too.
 

Mukandpuria

New Member
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1,413
yo bro good to see you back i am look out for you facebook for new pic!

lol a question like this was on a consulting case study book except it had a different twist! ahh

*thinking*
 

kinnell

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Abhi said:
yo bro good to see you back i am look out for you facebook for new pic!

lol a question like this was on a consulting case study book except it had a different twist! ahh

*thinking*
Hahah yeah, once my dad starts uploading pictures, I'll change my facebook picture. I have a bhangra pose at 13,776 ft at Machu Pichu.

My uncles would drill me with riddles when I was a kid so this was one of them. I'm pretty sure this is a pretty popular one too. Good luck, Abhi!
 

Rohit

New Member
Messages
163
kinnell said:
Here's the first one:

You have 12 balls. Identical except for the fact that one is a bit heavier than the others. You don't know which one. You have a 2 sided scale (you can put two things on both sides) and you can use it only 3 times. How do you find the heavier ball.

Don't look it up. Just think it out. I thought of a few variations for this problem too.
how about something a little harder? this one is easy. you weight 6 on one side 6 on the other, which ever is the lightest you dump those 6 out then split the remaining 6 into 2 groups of 3, again look for the lightest and dump that one out. now your left with 3 so u measure 2 of the 3 if they r the same weight then you know the 3rd ball is the one or if one is heavier then the other then you know that way as well ;)
 

Temurzai

New Member
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397
Rohit said:
kinnell said:
Here's the first one:

You have 12 balls. Identical except for the fact that one is a bit heavier than the others. You don't know which one. You have a 2 sided scale (you can put two things on both sides) and you can use it only 3 times. How do you find the heavier ball.

Don't look it up. Just think it out. I thought of a few variations for this problem too.
how about something a little harder? this one is easy. you weight 6 on one side 6 on the other, which ever is the lightest you dump those 6 out then split the remaining 6 into 2 groups of 3, again look for the lightest and dump that one out. now your left with 3 so u measure 2 of the 3 if they r the same weight then you know the 3rd ball is the one or if one is heavier then the other then you know that way as well ;)
rohit, u can only use 2 of the balls on one side at a time, not 6 on one side and 6 on the other. and u can only use the scale a total of 3 times.....so that doesnt work.
 

Meistro

Asi Shounk Nu Karaiyaan Muschaan Kundiyaan...
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2,065
Rohit said:
kinnell said:
Here's the first one:

You have 12 balls. Identical except for the fact that one is a bit heavier than the others. You don't know which one. You have a 2 sided scale (you can put two things on both sides) and you can use it only 3 times. How do you find the heavier ball.

Don't look it up. Just think it out. I thought of a few variations for this problem too.
how about something a little harder? this one is easy. you weight 6 on one side 6 on the other, which ever is the lightest you dump those 6 out then split the remaining 6 into 2 groups of 3, again look for the lightest and dump that one out. now your left with 3 so u measure 2 of the 3 if they r the same weight then you know the 3rd ball is the one or if one is heavier then the other then you know that way as well ;)
thats such desi thinking. gotta love it.
 

kinnell

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2,159
Rohit said:
how about something a little harder? this one is easy. you weight 6 on one side 6 on the other, which ever is the lightest you dump those 6 out then split the remaining 6 into 2 groups of 3, again look for the lightest and dump that one out. now your left with 3 so u measure 2 of the 3 if they r the same weight then you know the 3rd ball is the one or if one is heavier then the other then you know that way as well ;)
Yep, that's it. Now what if I were to tell you that there's more than one way? At least 5 more ways to do this. See if you can figure them out. (Your solution would be 6:3:1)

If you get bored, try 18 balls, using the scale again only 3 times.

And TZ, you can use put as many balls on any sides.
 

Saleem

Administrator
Staff member
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1,928
You could weigh 5 against 5. If they're equal, weigh the remaining two to find the heavier one.

if they're not equal, take the heavier 5:
weigh 2 against 2. if equal, the odd one out is heaviest. if not, weigh 1 against 1.

Another good one is if you have 6 balls, a 2-sided scale, and only TWO measurements to find which ball is a DIFFERENT WEIGHT than the others. (kinda spoiled it since its the same solution as above! ;))
 
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