Question
Some passengers boarded the bus at the interchange. At the first stop, 7 passengers alighted and 8 passengers boarded the bus. At the second stop, 3 passengers alighted and another 4 passengers boarded the bus. In the end, there were 6 passengers on the bus. How many passengers boarded the bus at the interchange at first?
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Some passengers boarded the bus at the interchange. At the first stop, 7 passengers alighted and 8 passengers boarded the bus. At the second stop, 3 passengers alighted and another 4 passengers boarded the bus. In the end, there were 6 passengers on the bus. How many passengers boarded the bus at the interchange at first?