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Old 02-25-2005   #1 (permalink)
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Measuring out 10 quarts

Three jars contain 19, 13, and 7 quarts, respectively. The first is empty, the others full. How can one measure out 10 quarts, using no other vessels?

You cannot approximate, i.e. you cannot fill the 19 quart jar halfway judging by sight. The solution must be an easy and organized one. All work must be shown.

---------------------------------------------------------------------------------------------------------

I got an answer, but one has to hold his finger to the jar in order to keep track of where the waterline was before he poured more water in it... Blah blah blah, basically, it's shaky. So I would greatly appreciate any help. Thanks guys!

- Alisa


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Old 02-25-2005   #2 (permalink)
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Re: Measuring out 10 quarts

19 13 7
19 13 0
19 6 7
19 6 0
19 0 6
18 0 7
18 7 0
12 13 0
12 6 7
5 13 7
18 0 7
18 0 0
5 13 0
0 13 5
0 11 7
7 11 0
7 4 7
14 4 0
11 13 0
11 6 7
11 6 0
11 0 6
10 0 7
10 0 0


Perhaps there may be a shorter way.....but here's one.....


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Old 02-25-2005   #3 (permalink)
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Re: Measuring out 10 quarts

But doesn't it start out at 0 13 7?


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Old 02-25-2005   #4 (permalink)
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Re: Measuring out 10 quarts

Oops.... I guess I need to learn to read better.....


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Old 02-25-2005   #5 (permalink)
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Re: Measuring out 10 quarts

Yeah, it starts out with 0,13,7, so 20 quarts total. Blah I still can't get it without having to mark off water levels, and I'm not sure if that's allowed. = /

Thanks for the help, though.

- Alisa


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"Physics is like sex. Sure, it may give some practical results, but that's not why we do it." - R. Feynman

Old 02-25-2005   #6 (permalink)
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Arrow Re: Measuring out 10 quarts

___I think I can do this. You must pour back & forth in a certain order.


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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter
Old 02-25-2005   #7 (permalink)
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Re: Measuring out 10 quarts

Quote:
Originally Posted by DivineNathicana
Three jars contain 19, 13, and 7 quarts, respectively. The first is empty, the others full. How can one measure out 10 quarts, using no other vessels?

You cannot approximate, i.e. you cannot fill the 19 quart jar halfway judging by sight. The solution must be an easy and organized one. All work must be shown.

---------------------------------------------------------------------------------------------------------

I got an answer, but one has to hold his finger to the jar in order to keep track of where the waterline was before he poured more water in it... Blah blah blah, basically, it's shaky. So I would greatly appreciate any help. Thanks guys!

- Alisa
Here is one solution. Poor back and forth as follows:

Code:
0	13	7
13	0	7
13	7	0
6	7	7
6	13	1
19	0	1
19	1	0
12	1	7
12	8	0
5	8	7
5	13	2
18	0	2
18	2	0
11	2	7
11	9	0
4	9	7
4	13	3
17	0	3
17	3	0
10	3	7


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Old 02-25-2005   #8 (permalink)
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Arrow Re: Measuring out 10 quarts

___Nice! Now I don't have to bother.


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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter
Old 02-25-2005   #9 (permalink)
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Re: Measuring out 10 quarts

Thanks! I'll go try that out.


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"Physics is like sex. Sure, it may give some practical results, but that's not why we do it." - R. Feynman

Old 02-26-2005   #10 (permalink)
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Arrow Re: Measuring out 10 quarts

___If you like counting problems, I refer you to a real world counting problem I set forth in the thread "Mathemagical Box". I have presented there sufficient information for you to arrive at a solution. A solution I have not bothered to find (yet). I entertain your solutions dear Reader.


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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter
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