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n(awal) . x + n(masuk) . x
------------------------------
n(awal) + n(masuk)
7,8= 35.8,2 + 5.x
-----------------
40
312 = 287 + 5x
312 - 287 = 5x
25 = 5x
x = 25/5 = 5
jadi , rata² 5 orang tsb adalah... 5
*smoga membantu...