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ub/uc=2/1
uc=15
ub/15=2/1
ub=30
ua/30=2/3
ua=20
ua-uc=20-15=5
UB : UC = 2 : 1
perbandingan UA : UB : UC = 4 : 6 : 3
UC = 15
UA = 4 x (15 : 3) = 4x5 = 20
UB = 6 x (15 : 3) = 6x5 = 30