If 12 men or 16 women can do a work in 172 days, how long will 21 men and 15 women to do the same work?

Question:If 12 men or 16 women can do a work in 172 days, how long will 21 men and 15 women to do the same work?

1.64 days

2.66 days

3.86 days

4.70 days


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