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73 = 70.n1 + 78.30 / n1 + 30
73 (n1 + 30) = 70n1 + 2340
73n1 + 2190 = 70n1 + 2340
73n1-70n1 = 2340-2199
3n1 = 150
n1 = 50 orang (D)