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An army of 12000 consists of Europeans a...

An army of 12000 consists of Europeans and Indians. The average height of a European is 5ft 10 inches and that of an Indian is 5ft 9 inches and that of the whole army is 5ft `9(3/4)` inches.
Then the number of Indians in the army is:

A

3000

B

4000

C

5500

D

2700

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