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5 Carpinteros ------------- 21 días
X ----------------------------- 15 días
21*X=5*15
X=(5*15)/21
X=3,57
Para 15 dias trabajan 3,57 carpinteros
B)
5 Carpinteros ------------- 21 días
X ----------------------------- 7 días
21*X=5*7
X=(5*7)/21
X=1,67
Para 7 dias trabajan 1,67 carpinteros