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Aplicas regla de 3 simple inversa.
A menos obreros mas dias.
5 ob------> 15d
3 ob------> x
x = 5 ob * 15d / 3 ob
x = 5 * 15 d/3 Simplificas el 3
x = 5 * 5d
x = 25 dias
Respuesta.
Los 3 obreros tardan 25 dias