Question 936899
 12 men and 18 Women can do a piece of work in 14 days 
 1 man & 1 woman can do the same work  in  = 14*12*18 days
 8 men and 12 women can do the same piece of work in   = {{{(14*12*18)/(8*12)}}}
                                                        ={{{7*9/2}}}
                                                        = {{{63/2}}}
                                                         =31.5 days
 Result : 8 men and 12 women can do the same piece of work in 31.5 days