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sistema de ecuaciones
5x+20y=350
x+y=40 x=40-y
reeplazamos
5(40-y)+20y=350
200-5y+20y=350
15y=150
y=10
x=40-10
x=30
tiene 30 billetes de de 5 y 10 billetes de 20
30 x 5= 150
40 350
Billetes Soles