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pria=x2= 70
x gabungan 73
f1+ f2 = 40 brp f1 nya?
rumus
x gab = (x1.f1 + x2.f2)/(f1+f2)
73 = 78.x + 70(40-x)/40
2920 = 78x + 2800 - 70x
120 = 8x
x = 15 org (A)
p = pria
78w + 70(40-w) = 73(40)
78w + 2800 - 70w = 2920
8w = 120
w = 15 orang