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3 : 4
3y : 4y
pembilang + penyebut = 35
3y + 4y = 35
7y = 35
y = 35 : 7
y = 5
maka
pembilang = 3y = 3 x 5 = 15
penyebut = 4y = 4 x 5 = 20
sehinga pecahannya
15/20
Jumlah = 35
Jumlah perbandingan = 3+4 = 7
perb.3 = 3/7 x 35 = 15
perb. 4 = 4/7 x 35 = 20
pecahan itu = 15/20