Reto...

[a2qmcvx]

Si una rana que cae a un pozo de 30 metros, por el día avanza 3 m y por la noche desciende 2, cuánto tarda?

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[nagavolu]

I do not know which language is this.... but i hope you can understand this:

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[mariqyes]

1, creo, soy tan mala en matematicas