Answer:
a = 290 kg
b = 210 kg
c = 230 kg
Explanation:
a + b = 500
b + c = 440
b = 440 - c
a + c = 520
a = 520 - c
440 - c + 520 - c = 500
460 = 2c
c = 230
a = 520 - 230
a = 290
b = 440 - 230
b = 210
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