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Y = Cantidad de Billetes de $10
X + Y = 26 (Ecuacion 1)
50X + 10Y = 940 (Ecuacion 2)
En (1): X = 26 - Y
Reemplazo en (2)
50(26 - Y) + 10Y = 940
1300 - 50Y + 10Y = 940
1300 - 40Y = 940
1300 - 940 = 40Y
360 = 40Y
Y = 360/40
Y = 9
Reemplazo en X = 26 - Y
X = 26 - 9
X = 17
Rta: Tiene 17 Billetes de $50 y 9 Billetes de $10