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Selisih = 18
Selisih perbandingan = 1
Jawab :
Ina = 7/1 × 18 = 136
Arfi = 8/1 × 18 = 144
Maaf kalau salah...
Arfi = 8x = ?
Selisih = 8x-7x = 18
x= 18 jadi
Ina = 7*18 = 126
Arfi = 8*18 = 144