Jawabanmu

2014-02-03T21:00:16+07:00
Ayah = a 
Ibu    = b 
a : b = 4:3

Jadi , 3/4 x 80 = 60
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2014-02-03T21:00:39+07:00
Jawab :
4/3 x 80 = 106,6 kg

mudah-mudahan bener :)
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