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Mathematics, 18.06.2020 02:57 leapfroggiez

En una caja de 50 lapiceros, 15 son del color rojo, 10 son de color azul, 12 son de color verde y el resto son de color negro¿que fraccion del total son de color negro?

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En una caja de 50 lapiceros, 15 son del color rojo, 10 son de color azul, 12 son de color verde y el...
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