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2/5 partes de 80=80 /5= 16x2= 32 monedas de $2
1/4 parte de 80=80/4=20 monedas de $1
2/5 + 1/4= 8/20 + 5/20= 13/20, es decir, 7/20 partes de 80= 80/20=4x7= 28 monedas de $0.50.