Jawabanmu

2014-06-03T19:39:06+07:00
75% dan 25%

Cu-63= x%
Cu-65= 100-x%
ArCu=(x.63) + (100-x.65)
63,5= 63x + 6500 - 65x /100
6350= -2x + 6500
2x = 150
x= 75 %

Cu-65 = 100-75% = 25%

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