 Hello and welcome to the session. In this session, we discussed the following question which says, 5 typists working 9 hours a day can type the manuscript of a book in 16 days. How many days will 4 typists take to do the same job each working 6 hours a day? Now let's move on to the solution. Now in the question we have 5 typists working 9 hours a day can finish the job in 16 days. Then 5 typists working 1 hour a day can finish the job in 16 into 9 days. So this shows that less the number of hours more would be the days to finish the same job. Then 1 typist working 1 hour a day can finish the job in 16 into 9 into 5 days. Now less the number of typists more would be the number of days to complete the same job. Then next we have 1 typist working 6 hours a day can finish the job in 16 into 9 into 5 upon 6 days. Now more the number of hours less would be the number of days taken to complete the job. Next we have 4 typists working 6 hours a day can finish the job in 16 into 9 into 5 upon 6 into 4 days. Now 4 times is 16, 3 times is 9, 2 times is 6, 2 times is 4. So this is equal to 2 into 3 into 5 days. That is equal to 30 days. Hence 4 typists working 6 hours a day can finish the job in 30 days. So our final answer is 30 days. So this completes the session. Hope you have understood the solution for this question.