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Mathematics, 20.05.2021 18:00 nicog94

Roberto comprou 2 cadernos a R$12,40 cada duas borrachas a R$0,80 centavos cada uma meia dúzia de lápis a R$0,60 centavos e meia dezena de canetas a R$2,10. Se Roberto tinha apenas uma nota de R$50,00quanto recebeu de troco?

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Roberto comprou 2 cadernos a R$12,40 cada duas borrachas a R$0,80 centavos cada uma meia dúzia de lá...
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