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N = x/7 = y/5 = z/3
x = 7 N
y = 5 N
z = 3 N
(x + z) y = 80000
Reemplazamos x, y, z en función de N
(7 N + 3 N) . 5 N = 80000
50 N² = 8000;
N² = 80000/50 = 1600
Por lo tanto N = 40
Saludos Herminio