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Several ways to achieve this - here is one solution.

Fill the 5 litre container and pour it all into the 9 litre container.

Fill the 5 litre container and pour it into the 9 litre container until the latter is full - leaving 1 litre in the 5 litre container.

Empty the 9 litre container.

Fill the 3 litre container and empty into 9 litre container. Repeat. There are now 6 litres in the 9 litre container.

Pour the 1 litre from the 5 litre container into the 9 litre container which now contains 7 litres.

Q: Three containers have capacities of three five and nine liters How can these containers be used to measure exactly seven liters of water?

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A pail is not a standard measure. It can have different capacities.

This method works with any such problem, as long as the two buckets' liter-capacities (or gallon capacities, etc.) have no common factors, or else the common factors are also factors of the amount you're trying to measure. Fill the 7-liter bucket, and empty 5 liters of it into the 5-liter bucket; then dump out the 5 liters. Two liters will remain in the 7-liter bucket; transfer them to the 5-liter bucket. Fill the 7-liter bucket again, and empty enough of the bucket into the 5-liter bucket to fill it. That should only be 3 liters transfered, leaving 4 liters left in the 7-liter bucket. QED.

Different cars have tanks with different capacities.

Liters and millimeters are different units of measurement- liters measure volume, and meters measure distance. There are 1000 millimeters in a meter and 1000 milliliters in a liter.

water. Anything that is liquid can be measured in liters.

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A pail is not a standard measure. It can have different capacities.

(1,000 liters) / (2 liters per container) = 500 containers.

You cannot. Each of the three containers has a capacity of an even number of litres. Their sums and differences will always be even. There is, therefore, no way to measure out an odd number of litres using them.

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Exactly 30,000 liters.

Milliliters - pots of yogurt don't normally come in liter sized containers. You measure yogurt in ml and milk in l. You can also measure it in grams.

This method works with any such problem, as long as the two buckets' liter-capacities (or gallon capacities, etc.) have no common factors, or else the common factors are also factors of the amount you're trying to measure. Fill the 7-liter bucket, and empty 5 liters of it into the 5-liter bucket; then dump out the 5 liters. Two liters will remain in the 7-liter bucket; transfer them to the 5-liter bucket. Fill the 7-liter bucket again, and empty enough of the bucket into the 5-liter bucket to fill it. That should only be 3 liters transfered, leaving 4 liters left in the 7-liter bucket. QED.

Meters measure length, liters measure capacity, and kilograms measure weight.

Different cars have tanks with different capacities.

kilometers measure distance and Liters measure liquid.

Exactly 0.4

Millimeters can't be converted to liters. Millimeters measure length, while liters measure volume.