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A factory packs water in half litre, one litre, two litre and five litre bottles. On a certain day, the factory 20840 bottles of water. Out of these, 8120 were half litre bottles and 3960 were two litre bottles. One litre bottles were 2000 more than the two litre bottles. The rest were five litre bottles. How many five litre bottles were there?
A. 2800
B. 6760
C. 6800
D. 18040