5a + 3c + 2s = 500 a = 10c
S = 180-20 = 160 a = 10c. 5*10c + 3c + 2*160 = 500 50c + 3c + 320 = 500 53c = 500-320 = 180 C = 3.396 a = 10c = 10*3.396 = 33.96
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