Ages (Rounded to the Nearest Whole Year) of Employees at a Large

Essay

Ages (rounded to the nearest whole year) of employees at a large company were grouped into a distribution with the following class limits:
20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
The class limits for the class 50 up to 60 are _______ and ______.