30 Tahun
Penjelasan dengan langkah-langkah:
Ayah/Kakek = 1/3
Kakek = 90
Ayah
= Umur Kakek : 3 × Bagian Ayah
= 90 : 3 × 1
= 30
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30 Tahun
Penjelasan dengan langkah-langkah:
Ayah/Kakek = 1/3
Kakek = 90
Ayah
= Umur Kakek : 3 × Bagian Ayah
= 90 : 3 × 1
= 30