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x : n2 = 8 -----> dengan n2 = n1 + 2
maka
x = 12n1
x = 8 n2 = 8(n1+2) = 8 n1 + 16
maka
12n1 = 8n1 + 16
12n1 - 8n1 = 16
4n1 = 16
n1 = 16/4
= 4
banyak kelereng = 12. n1 = 12.4 = 48
Jadi banyak kelompok awal adalah 4 orang dan kelerengnya adalah 48 buah (C)