If 4 men or 5 women can construct a will in 82 days, the how long will it take for 5 men and 4 women to do the same work?

4 men or 5 women can construct a wall in 82 days. How long will it take for 5 men and 4 women to do the same ?

If 5 men or 8 women can do a piece of work in 12 days, how many days will be taken by 2 men and 4 women to do the same work?

If 12 men or 18 women can do a piece of work in 14 days, then how long will 8 men and 16 women take to finish the work ?

If 3 men or 4 women can reap a field in 43 days, how long will 7 men and 5 women take to reap it?

If 5 men or 9 women can do a piece of work in 19 days,then in how many days will 3 men and 6 women do the same work? 12 b.15 c.backslash18 d.21