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3 + x
5 + x (dijumlahkan)
9 + 3x = 45
x = 12
bilangan terkecil = 1 + x = 1 + 12 = 13
bilangan terbesar = 5 + x = 5 + 12 = 17
jumlahnya = 13 + 17 = 30 (B)
karena 45:3=15
15 itu nilai tengahnya jadi bilangan sebelum 15 kan 13 ,sesudah bilangan 15 kan 17 . jadi jumlah 13+17=30
semoga membantu:-)