Two thirds of a 3 litre jug is 2 litres.
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Fill the seven litre jug. Empty into 9l jug. Refill 7 litre jug and empty into 9l jug. 7l jug now contains 5l, whilst 9l jug is full. Empty 9l jug. Pour contents of 7l jug into 9l jug. Refill 7l jug and empty into 9l jug. The remainder in the 7l jug will be 3 litres
0.6667
Well, honey, you can fill up the 5 liter jug, pour it into the 7 liter jug, fill up the 5 liter jug again, and pour it into the 7 liter jug until it's full. That leaves you with 3 liters in the 5 liter jug. Voila, you've measured out 4 liters using those jugs. Easy peasy lemon squeezy!
Two-thirds of a liter is equal to 0.666... liters, which can be simplified to approximately 0.67 liters when rounded to two decimal places. This can also be expressed as 666.67 milliliters, as there are 1000 milliliters in a liter.
It is two thirds = 2/3 = 66.66... %