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Which of the following is equal to $$2.9\ \text{litre} + 4\ \text{litre}\ 9\ \text{millilitre}$$?
Since $$1\ \text{litre} = 1000\ \text{millilitre}$$, 9 millilitre is $$0.009$$ litre, so 4 litre 9 millilitre is $$4.009$$ litre. Adding, $$2.9 + 4.009 = 6.909$$ litre.
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