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Hernan pago 75 billetes B=x
X(5)+X(10)=75 15X=75 X=75/15
X=3 entonces pago con 15 billetes de 5 y con 30 billetes de 10
X+Y=66
X-Y=18
Sumamos esa ecuacion entonces tenemos
2X=84 X=84/2 X=42
Entonces sustituimos 42+Y=66
Y=66-42 Y=24