Gọi số người có trên tàu ban đầu là `x`
Ta có :
`x - 19 + 17 = 63`
`x - 19 = 63 - 17`
`x - 19 = 46`
`x = 46 + 19`
`x = 65`
Như vậy lúc đầu trên tàu có `65` người
Đáp án:
65 người
Giải thích các bước giải:
Số người lúc ban đầu ở trên tàu là :
65 - 17 + 19 = 65 ( người )
Đáp số : 65 người
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