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A - B = 2,5
------------------- +
2A = 22,5
A = 11,25
B = 11,25 - 2,5 = 8,75
A:B = 11,25 : 8,75 = 9:7
a - b = 2,5.....a = 2,5 + b
(2,5 + b )+ b =20
2,5 + 2b = 20
2b = 17,5
b = 8,75
a =11,25
Perbandingan kecil terhadap besar =
8,75 : 11,25 = 7 berbanding 9