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6.(140+k) = 80+200+420+8k+100
840+6k = 800+8k
2k = 40
k = 20 (Ga ada jawabannya)
Minimumnya 47, Maximalnya 60
Jangkauannya 13
Rentangnya 13+1 = 14
Bagi dengan 3,
14/3 = 4,66 bulatkan ke atas = 5