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6 x 9 = 54 ==> 216 pakaian
7 x 10 = 70 ==> n pakaian
54 : 70 = 216 : n
54n = 216 x 70
54n = 15120
n = 15120 : 54
n = 280 potong
Jawaban: C
*semoga membantu. sukses selalu ^_^