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ibu : 1 dasawarsa= 10thn, 3×10+8=38thn
selisih 1thn bro
1 dasawarsa = 10 thn
umur ayah sekarang = (4.8) + 2+5 =39 thn
umur ibu sekarang = (3.10) +(1.8) = 38 thn
selisih umur ayah dan ibu
= 39-38 = 1
jadi, selisihnya adalah 1 tahun.