Assuming an unlimited supply of water, fill the 4 l. pour that onto the 9l. refill the 4l and pour that in the 9l. it now has 8l (not full) fill the 4l again pourinr carefully into the 9l leaving 3l in the 4l container. empty the 9l. pour the 3l from the 4 in to the 9l container. Refill the 4l. Pour that into the 9l (4+3 =7). fill the 4l again and pourinto the 9l leaving 2l in the 4l container. Dump the 9l container, pour in the 2l from the 4l container. fill the 4l again. pour into the 9l (2+4 = 6) and you are finished.
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.
This works with two odd numbered jars but I don't think it works with both even to get an odd
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;-)
uu
by my hands
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.
This works with two odd numbered jars but I don't think it works with both even to get an odd
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.
uu
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.