Question
A boat had some passengers at the beginning. After 16 passengers alighted from the boat and another 55 passengers boarded the boat, there were 4 times as many passengers as before. How many passengers were there on the boat at first?
4 m

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A boat had some passengers at the beginning. After 16 passengers alighted from the boat and another 55 passengers boarded the boat, there were 4 times as many passengers as before. How many passengers were there on the boat at first?