Jawabanmu

2014-01-28T20:43:44+07:00
A + b = 60
5x + 7x = 60
12 x = 60
x = 60 /12 = 5

sehingga pembilang = 5.x = 5.5 = 25
dan penyebut = 7. x = 7.5 = 35

dimana 25 + 35 = 60 :)