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Total de dinero: 30(0,50)+ 0,20b = 25
15 + 0,20b = 25
0,20b = 25 -15
0,20b = 10
Multiplicando la igualdad por 100:
20b= 1000
b= 1000 / 20
b= 50
En total son 50 monedas de S/.0,20