Question
A boat carrying some passengers arrived at Station K. At Station K, only 57 passengers alighted the boat. It then left for Station L. At Station L, only 28 passengers boarded from the boat. When the boat left Station L, there were 49 passengers on it. How many passengers were there on the boat when it first arrived at Station K?
4 m

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A boat carrying some passengers arrived at Station K. At Station K, only 57 passengers alighted the boat. It then left for Station L. At Station L, only 28 passengers boarded from the boat. When the boat left Station L, there were 49 passengers on it. How many passengers were there on the boat when it first arrived at Station K?