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Resolvemos :
s + 1 + s + 3 + s + 5 = 21
s + s + s + 1 + 3 + 5 = 21
3s + 9 = 21
3s = 21 - 9
3s = 12
s = 12/3
s = 4
s + 1 = 4 + 1 = 5
s + 3 = 4 + 3 = 7
s + 5 = 4 + 5 = 9
Solución : Los números son : 5, 7 y 9
5 ; 9 y 7