Answer:
4
Step-by-step explanation:
i hope u understand !0k ?????
Answer: The time taken by both of them if they work together is given by

Step-by-step explanation:
Since we have given that
Time taken by Blake to paint one room = 9 hours
Time taken by Ned to paint one room = 6 hours
Work done by Blake = 
Work done by Ned = 
Total work done by both of them together is given by

So, the time taken by both of them if they work together is given by

The irrational numbers are √10,√27,√99.