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A= 3/(3+9)×39
= 3/12×39
=1/4×39
= 9,75
B= 9/(3+9)×39
= 9/12×39
= 3/4×39
= 3×9,75
= 29,25
selisihnya B-A= 29,25-9,75
= 19,50 = 19,5
Jadi, selisihnya adalah 19,5