Do men and women do different kinds of work to make this article?

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Q. Q.2 women and 5 men together finish a work in 4 days.3 women and 6 men can finish it in 3 days .find the time taken by 1 women and men to finish the work.
please send different methods to do this solution
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Q. $10$ mens can do a work in $15$ days and $15$ women can do a work in $12$ day, if both $10$ men and $15$ women, so the work how many day the to complete the work.