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These are different units. Liters is volume (3 dimensions) Kilo is short for kilogram which is mass. If you are measuring water (which conveniently has a density of 1.0) then 1 liter = 1 kilogram But if you have a liter of mercury then 1 liter = 13.6 kilograms
Fill a container three times using the 7-liter jar (which will give you 21 liters), then take out water with the 11-liter jar (which will give you 10 liters).
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.