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x=6,8y. (1)
z/6 = 6,3
z = 37,8. (2)
6,8y + 37,8 / y + 6 = 6,6
6,8y +37,8 = 6,6y + 39,6
0,2y = 1,8
y = 9
jadi jumlah murid mula" adalah 9 orang