A certain number of persons can complete a piece of work in 55 days. If there were 6 persons more, the work could be finished in 11 days less. How, many persons were originally there ?

A certain number of persons can complete a piece of work in 55 days. If there were 6 persons more, the work could be finished in 11 days less. How, many persons were originally there ?
1). 17
2). 24
3). 30
4). 22

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