Chances are a call center will rarely receive *exactly* 1000 calls, or 1500, or 2000, ...
A more likely choice would be, for instance,

,

, ...
Answer:
1) they will finish 11/30 of the homework in an hour
2) 1/6x + 1/5x = 1
i am not a 100% sure abt #2
There are 14 thirds in 4 2/3