You have a four-ounce glass and a nine-ounce glass. You have an endless supply of water. You can fill or dump either glass. It turns out that it’s possible to measure six ounces of water using just these two glasses. What’s the fewest number of steps in which you can measure six ounces?
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5 guesses to Pour the Water |
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December 1st, 2009 | Category: 
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1. Glass 4 into Glass 9
2. Glass 4 into Glass 9
3. Glass 4 into Glass 9
-Glass 4 has 3 oz
-Glass 9 has 9 oz
4. Pour out Glass 9
5. Fill with Glass 4
-Glass 4 has 0 oz
-Glass 9 has 3 oz
6. Glass 4 into Glass 9
7. Glass 4 into Glass 9
-Glass 4 has 2 oz
-Glass 9 has 9 oz
8. Pour out Glass 9
9. Fill with Glass 4
-Glass 4 has 0 oz
-Glass 9 has 2 oz
10. Glass 4 into Glass 9
-Glass 4 has 0 oz
-Glass 9 has 6 oz
1. Glass 4 into Glass 9
2. Glass 4 into Glass 9
3. Glass 4 into Glass 9
-Glass 4 has 3 oz
-Glass 9 has 9 oz
4. Pour out Glass 9
5. Fill with Glass 4
-Glass 4 has 0 oz
-Glass 9 has 3 oz
6. Glass 4 into Glass 9
7. Glass 4 into Glass 9
-Glass 4 has 2 oz
-Glass 9 has 9 oz
8. Pour out Glass 9
9. Fill with Glass 4
-Glass 4 has 0 oz
-Glass 9 has 2 oz
10. Glass 4 into Glass 9
-Glass 4 has 0 oz
-Glass 9 has 6 oz
Wow, two identical guesses . . . both very good. But the Riddle Dude can do this in three steps!
Keep trying though as you do have the general idea of how this works. : )
Step 1: Pour 4oz of water in the 4oz
Glass.
Step 2: pour another 4oz in the 4 oz glass.
Step 3: Dump out 2oz from the 4 oz.
Same as above^ diff email