This works with two odd numbered jars but I don't think it works with both even to get an odd
Here's a step-by-step solution: Fill up the 5-liter jar completely with water. Pour the water from the 5-liter jar into the 3-liter jar until the 3-liter jar is full. Now, you are left with 2 liters of water in the 5-liter jar. Empty the 3-liter jar. Pour the 2 liters of water from the 5-liter jar into the 3-liter jar. Fill up the 5-liter jar again. Pour enough water from the 5-liter jar into the 3-liter jar to fill it completely (this will take 1 liter). Now, you are left with 4 liters of water in the 5-liter jar, which gives you the required 8 liters of water.
7, 5 Liter jars 7, 0 = fill 7 liters jar 2, 5 = transfer to the 5 liters jar 2, 0 = emtry the 5 liters jar 0, 2 = transfter to 5 liters jar 7, 2 = fill in the 7 liter jar 4, 5 = transfer 7 liter to 5 liter jar 4, 0 = emtry to 5 liters jar 0, 4 = transfer to 5 liters jar 7, 4 = fill in 7 liter jar 6, 5 = transfer 7 liter to 5 liter jar Fill the 7 liter jar and tip into the 5liter jar. you now have 2 litres in the 7 liter jar, empty the 7 liter and tip the 2 liters into the 5liter jar. Fill the 7liter and tip into 5 liter, you now have 4 liters in the 7 liter jar, empty the 5 liter jar and put 4liters from 7 liter jar into it. Again fill the 7 liter jar, 1 more liter will fill the 5 liter jar so empty the 7 liter into the 5 liter, 6liters left in the 7 liter jar;-)
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by my hands
Fill up 8 liter bucket and 5 liter bucket. Pour 3 liter out from the 5. Pour 6 liter from the 8. Add the remains from the 5l back to the remains in the 8 liter and you have 4 liters.
Here's a step-by-step solution: Fill up the 5-liter jar completely with water. Pour the water from the 5-liter jar into the 3-liter jar until the 3-liter jar is full. Now, you are left with 2 liters of water in the 5-liter jar. Empty the 3-liter jar. Pour the 2 liters of water from the 5-liter jar into the 3-liter jar. Fill up the 5-liter jar again. Pour enough water from the 5-liter jar into the 3-liter jar to fill it completely (this will take 1 liter). Now, you are left with 4 liters of water in the 5-liter jar, which gives you the required 8 liters of water.
1)Transfer 7 liters from the 12-liter jar into the 7-liter jar.We now have 5 liters in the 12-liter jar and 7 liters in the 7-liter jar. The 5-liter jar is empty, as of now.2)Transfer 5 liters from the 7-liter jar into the 5-liter jar.The 12-liter, 7-liter, 5-liter jars now contain 5, 2 and 5 liters respectively.3)Empty the contents of the 5-liter jar into the 12-liter jar.The 12, 7, 5- liter jars now contain 10, 2 and 0 liters respectively.4)From the 7-liter jar, take out 5 liters and pour 7 liters from the 12-liter jar into the 7-liter jar.We now have 3 liters in the 12-liter jar and 7 in the 7-liter one, while the 5-liter jar has only two liters in it.5)Fill up the remainder of the 5-liter jar using the 7-liter jar.That leaves us with 3 liters on the 12-liter jar and 4 liters in the 7-liter jar. The 5-liter jar is full.6)Pour the contents of the 5-liter jar into the 12-liter jar.There are 8 liters in the 12-liter jar and 4 liters in the 7-liter jar, while the 5-liter jar is empty.7)Pour the 4 liters that are in the 7-liter jar into the 5-liter jar.We now have 8 liters in the 12-liter jar and 4 liters in the 5-liter jar. The 7-liter jar is empty.8)Fill the 7-liter jar using the 12-liter jar.There is now only 1 liter in the 12-liter jar and 7 liters in the 7-liter jar and 4 liters in the 5-liter jar.9)Fill up the 5-liter jar using the 7-liter jar.There is now 1 liter in the 12-liter jar and 6 liters in the 7-liter jar and 5 in the 5-liter jar.NOTE: This might not be the only way, or the shortest way to do it.
7, 5 Liter jars 7, 0 = fill 7 liters jar 2, 5 = transfer to the 5 liters jar 2, 0 = emtry the 5 liters jar 0, 2 = transfter to 5 liters jar 7, 2 = fill in the 7 liter jar 4, 5 = transfer 7 liter to 5 liter jar 4, 0 = emtry to 5 liters jar 0, 4 = transfer to 5 liters jar 7, 4 = fill in 7 liter jar 6, 5 = transfer 7 liter to 5 liter jar Fill the 7 liter jar and tip into the 5liter jar. you now have 2 litres in the 7 liter jar, empty the 7 liter and tip the 2 liters into the 5liter jar. Fill the 7liter and tip into 5 liter, you now have 4 liters in the 7 liter jar, empty the 5 liter jar and put 4liters from 7 liter jar into it. Again fill the 7 liter jar, 1 more liter will fill the 5 liter jar so empty the 7 liter into the 5 liter, 6liters left in the 7 liter jar;-)
pour the water into the 9 liter pail and pour some water into the 4 liter pail after pour the water into the liter 7 pail the pour with your imagination 3 quarters liter into the 4 liter and and it to the first 4 liter you poured.
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by my hands
Fill the 9 liter jugPour 4 liters off (into the 4 liter jug)Empty the 4 liter jugOf the remaint 5 liters in the 9 liter jug, fill the 4 liter jugEmpty the 4 liter jugPour the remaining 1 liter into the 4 liter jugFill the 9 liter jugPour off 3 liters by filling the 4 liter jug which already has 1 liter in itThe 9 liter jug now holds 6 liters
you don't
Fill the 5 litre and empty into the 12 litres twice. Then fill it again and with this pour to the brim of the 12 litres. You are then left with 3 litres in the 5 litre jug. Because: 5+5+5=15, however you have only space for 12. i.e. 15-12 is 3
Fill the 4 liter with water and empty into the 3 liter, leaving one liter in the 4 liter receptacle. Dump the 3 liter water, and pour the remaining one liter from the 4 liter into the 3 liter. Fill the four liter and dump into 3 liter until full. You now have added two liters to the 3 liter receptacle and 2 liters remain in the 4 liter receptacle.
* Fill 4 liter jug. * Empty the 4 liter jug into the 5 liter jug. * Again fill 4 liter jug. * Fill up the 5 liter jug with the 4 liter jug. * There are now 3 liters in the 4 liter jug.
Notes: There is most likely a more efficient way to do this, but this is the best I can do for now.Notation: ( x , y ) where x is the amount of water in the 5-liter container and y is the amount of water in the 7-liter container1. Fill the five-liter container ( 5 , 0 )2. Pour the five-liter container into the seven-liter container ( 0 , 5 )3. Fill the five-liter container ( 5 , 5 )4. Fill the seven-liter container with the five-liter container, leaving 3 liters in the five-liter container ( 3 , 7 )5. Pour out the seven-liter container ( 3 , 0 )6. Pour the five-liter container into the seven-liter container ( 0 , 3 )7. Fill the five-liter container ( 5 , 3 )8. Fill the seven-liter container with the five-liter container, leaving 1 liter in the five-liter container ( 1 , 7 )9. Pour out the seven-liter container ( 1 , 0 )10. Pour the five-liter container into the seven-liter container ( 0 , 1 )11. Fill the five-liter container ( 5 , 1 )12. Pour the five-liter container into the seven-liter container ( 0 , 6 )