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18 × 7 = 126
rata2 bilangan yg tersisa adalah:
246-126 = 120
maka :
120/(30-17)
= 120/ 13
= 9,2
8,2 . 30 = (18 . 7) + (X . 12)
246 = 126 + 12X
12X = 246 – 126
12X = 120
X = 120 / 12 = 10