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x + y = 3720 (a)
x + 5/8(y) = 3720(95/124) (b)
en (b): x + 5/8(y) = 2850 (c)
en (c): 8x + 5y = 2850(8) es decir: 8x + 5y = 22800 (d)
multiplicando (a) por -5 nos queda: -5x - 5y = -18600 (e)
sumando (e) con (d): 8x + 5y = 22800
nos da: 3x = 4200
de donde x = 4200/3 = 1400 Kg