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5gerbong = 5×20 = 100
100-35 = 65 + 27 = 92penumpang
5 gerbong = 5 x 20 = 100 orang
turun 35 orang
sisa 100 - 35 = 65 orang
naik 27 orang
penumpang menjadi 65 +27 = 92 orang