Question
A ferry carrying some passengers arrived at Station M. At Station M, only 27 passengers boarded the ferry. It then left for Station N. At Station N, only 30 passengers alighted from the ferry. When the ferry left Station N, there were 53 passengers on it. How many passengers were there on the ferry when it first arrived at Station M?
4 m

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A ferry carrying some passengers arrived at Station M. At Station M, only 27 passengers boarded the ferry. It then left for Station N. At Station N, only 30 passengers alighted from the ferry. When the ferry left Station N, there were 53 passengers on it. How many passengers were there on the ferry when it first arrived at Station M?