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Weighing VI.


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16 replies to this topic

#11 bluper

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Posted 15 March 2008 - 06:32 AM

"You have 9 balls, all of equal size. One ball is slightly heavier than the other 8. Using a set of scales only twice, can you determine which is the heavy ball?" -- better wording to eliminate confusion about the fact that you said all balls were equally heavy
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#12 TOPHAT

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Posted 21 March 2008 - 04:52 PM

Roll the balls down an incline at the same time and the one wich reaches the bottom first is the slightly heavier one
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#13 plortylox

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Posted 23 March 2008 - 01:52 AM

i thought all objects fall at the same speed? except for the ones that are too light

and i also thought the other variable was wind resistance
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#14 Anhad

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Posted 26 March 2008 - 07:14 PM

Select 6 balls and Weigh 3 on one side and 3 on the other. Select the pile that is heaviest. of they are the same weight then the Heavy ball is in the pile you didn't weigh.

Now you have 3 balls one of witch is the heavy ball Select 2 balls adn compare there weight. if nether of them are the heavy ball the one not weighed was.


Yupp!! thas the right answer.. groups of 3 and proceed.. bout its interesting to note that the question mentioned one ball to be bit heavier. Had it been lighter or heavier.. then finding it out in 2 chances is not possible, unless u get lucky in the first try.
\m/
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#15 Nitroxdm

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Posted 29 March 2008 - 05:48 AM

Yupp!! thas the right answer.. groups of 3 and proceed.. bout its interesting to note that the question mentioned one ball to be bit heavier. Had it been lighter or heavier.. then finding it out in 2 chances is not possible, unless u get lucky in the first try.
\m/


Ex-squeeze me? Baking powder? What are you trying to say there?

If you don't get the baking powder reference click here.
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#16 Malfure

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Posted 22 April 2008 - 05:22 AM

divide the balls into groups of 4

put the 2 groups on the scale, if they are of equal weight, then it has to be the last ball. If they are different weight, split the heavier group into 2 groups of 2, then with the heavier group; instead of using the scale; grab the heavier group and its only a matter of weighing them yourselves (use your hands and see which one is heavier) to find the ball; or guess... you have a 50 50 chance.

It said nothing against using yourself as a weight device.

The divide by 3 method is the best because it gives you the answer, but 2 groups of 4 was my first guess so i felt like making it my final and only guess.
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#17 Tiger Fan

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Posted 09 October 2008 - 04:52 AM

Weigh 3 on each side of the scale...leaving 3 out.

Whichever trio is heavier (the left out set if the two sides of the scale were equal), take 2 of those balls (one on each side of the scale). The heaviest will be either one of those balls, or the left out ball if the two on the scale are equal... :lol:
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