16. A alone can finish a work in 10 days and B alone can do it in 15 days. If they work together and finish it, then out of a total wages of Rs. 75. A will get:

17. A can do a piece of work in 10 days and B can do the same piece of work in 20 days. They start the work together but after 5 days. A leaves off. B will do the remaining piece of work in:

18. If 3 men or 4 women can construct a wall in 43 days, then the number of days that 7 men and 5 women take to construct it, is: