Question
At the bus interchange, some passengers boarded the bus. At the third stop, 10 passengers alighted and 8 passengers boarded the bus. At the fourth stop, only 20 passengers boarded the bus. When the bus left the fourth stop, there were 53 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 third stop, 10 passengers alighted and 8 passengers boarded the bus. At the fourth stop, only 20 passengers boarded the bus. When the bus left the fourth stop, there were 53 passengers on the bus. How many passengers boarded the bus at the interchange?