4 men can do a work in 5 days and 6 women can do the same work in 4 days if 5 men and 6 women can work together they will complete the work in
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5 men— 10days —1 work
5men—1day — (1/10) work
12women —15days—1 work
12women —1day—(1/15)work
=> 6women —1day—(1/30) work
Hence, 5men + 6 women — 1 day — (1/10)+(1/30) = (2/15)th work
=> 5men + 6 women —(15/2)days - 1 work.
5men + 6 women can do the same work in 7.5 days.
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