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a = ½b atau b/2
c = 5/4b
c = 40
→ c = 5/4b
40 = 5/4b
40 : 5/4 = b
32 = b
→ a = ½b
a = ½.32
a = 16
→ maka jumlah umur afifah dan hafid adalah a + b = 16 + 32 = 48 tahun