Question
At the bus interchange, some passengers boarded the bus. At the fourth stop, 13 passengers alighted and 7 passengers boarded the bus. At the third stop, only 29 passengers boarded the bus. When the bus left the third stop, there were 59 passengers on the bus. How many passengers boarded the bus at the interchange?
3 m

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At the bus interchange, some passengers boarded the bus. At the fourth stop, 13 passengers alighted and 7 passengers boarded the bus. At the third stop, only 29 passengers boarded the bus. When the bus left the third stop, there were 59 passengers on the bus. How many passengers boarded the bus at the interchange?