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y: monedas de 50
x+y=9 ⇒ y = 9-x
0.20x + 0.50y = 3
reemplazando:
0.20 x + 0.50 ( 9-x) = 3
0.20x+ 4.5 - 0.50 x =3
0.30x =1.5
x= 5//
y = 9- x
y= 9-5 =4 //