Respostas

2014-07-09T17:18:45-03:00
(6r + 6y + 6x)/3 = 24
6r + 6y + 6x = 72
6 . (r + y + x) = 72
r + y + x = 12
r + (r+1) + (r+2) = 12
3r + 3 = 12
3r = 9
r = 3
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