The Ages of the Machines in One of the Production

Multiple Choice

The ages of the machines in one of the production lines in your company are exhibited in the frequency distribution table below. Two additional machines have been added to the production line,and the median age of the machines didn't change.
What is the minimum number of new (0-year-old) machines that you need to purchase to change the median age of the machines?

A) 1
B) 2
C) 3
D) 4
E) 5