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12,6x12=151,2
18,2x6=109,2
20-12-6 = 2
284-151,2-109,2 = 23,6
Rata rata dari 2 bilangan terakhir = 23,6 : 2
= 11,8
12.12,6 = 151,2
6.18,2 =109,2
--> 20 - 12 - 6 = 2
--> 284 - 151,2 - 109,2 = 23,6
=> 23,6 : 2
=> 11,8