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<=> 3 / 5 : 4 / 15
<=> 3 / 5 * 15 / 4
<=> (3 * 15) / (5 * 4)
<=> 45 / 20
<=> 2 (5 / 20)
<=> 2 (1 / 4)
dikali silang
jb: 13 × 15 = 195
5 × 4 = 20
jadi hasilnya 195/20