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a + b = 48
a : b = 3 : 5
a= 3/(3 + 5) x 48 b = 5/3 x 18
= 3 x 6 = 5 x 6
= 18 = 30
pecahan = 18/30
bukti a + b = 18 + 30 = 48
a : b = 18 : 30 = 3 : 5
x + y = 48
x/y = 3/5
5x = 3y
persamaan x + y = 48 kita kalikan 3 menjadi:
3x + 3y = 144
3x + 5x = 144
8x = 144
x = 18
y = 30
maka bilangan itu: 18/30