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maka:
50-x+x+40-x+25 = 100
50+40-x+25 = 100
115-x = 100
-x = 100-115
-x = -15
x = 15 orang(C)
x = ( 50 + 40 + 25 ) - 100
= 115 - 100
= 15 orang
jawabnnya C