Five women can do a work in 36 days. If the ratio of the capacity of a man to that of a woman is 3 : 1, then how many days will it take for 5 men to complete the same work?

The total work is 180 woman-days (5 x 36). Because a man has three times the capacity of a woman, 5 men equal the capacity of 15 women. The time required for 5 men to finish the work is 180 / 15, which equals 12 days.

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