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rata2 gabungan = ( p . rt2 nilai pria + w . rt2 nilai wanita) / (p+w)
7,5 = (8,1p+7,2w)/(p+w)
7,5(p+w) = 8,1p+7,2w
7,5p+7,5w = 8,1p+7,2w
0,3w=0,6p
w/p=0,6/0,3
sehingga w : p = 2 : 1 (B)