If p p p men can complete a work in q q q days and q q q women can complete the same work in p p p days, and if $20$ men and $16$ women work together,...
Question
If men can complete a work in days and women can complete the same work in days, and if $20$ men and $16$ women work together, they can finish the work in days. What is the ratio of the efficiency of a man to that of a woman?