obreros días
5 → →→→→→→→→15
3 →→→ →→→→→ x
x=15x3
5
x= 45/5
x=9║
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Regla de 3 inversa.
A menos obreros + días
5ob----------> 15d
3ob---------> x
x = (5ob * 15d)/3ob
x = 75d/3
x = 25d
Respuesta.
Los 3 obreros tardan 25 días
obreros días
5 → →→→→→→→→15
3 →→→ →→→→→ x
x=15x3
5
x= 45/5
x=9║