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biem = B
cinthia = C
A = 3 + B
B = 5 + C
A + B + C = 43
3 + B + 5 + C + C = 43
3 + 5 + C + 5 + C + C = 43
13 + 3C = 43
3C = 30
C = 10
B = 5 + C
= 5 + 10
= 15
A = 3 + B
= 3 + 15
= 18
B = C + 5 --> C = B - 5
A + B + C = 43
substitusi
A + B + C = 43
B + 3 + B + B - 5 = 43
3B = 43 - 3 + 5
3B = 45
B = 15
Umur Amy:
A = B + 3
A = 15 + 3
A = 18 tahun
semoga membantu ya :)