10 women can do a piece of work in 6 days, 6 men can do the same work in 5 days and 8 children can do it in 10 days. What is the ratio of the efficiency of a woman, a man and a child, respectively?

Using the total work constant method, let the total work be the least common multiple of the given days, which is 60 units. A woman completes 1 unit per day, a man completes 2 units per day, and a child completes 0.75 units per day. To remove fractions, multiply these daily capacities by 4 to get the ratio. The resulting efficiency ratio of a woman to a man to a child is 4 is to 8 is to 3.

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