
10 + 10 + s = 180
S = 18020 = 160
a = 10c.
5*10c + 3c + 2*160 = 500
50c + 3c + 320 = 500
53c = 500320 = 180
C = 3.396
a = 10c = 10*3.396 = 33.96
posted by Henry
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