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Bilangan pertama : A
Bilangan kedua : B
Bilangan ketiga : C
A + B + C = 40
A = 2B = 6C
B = 3C
Dik : C = ?
Jawab :
A + B + C = 40
6C + 3C + C = 40
10C = 40
C = 4
Jadi, Nilai dari bilangan C adalah 4.