Answer:
 where n is the number of holes drilled in the work bench
 where n is the number of holes drilled in the work bench
Explanation:
Given: The area of the entire work bench before the holes are drilled 
is given by 
 .
.
The area of one hole is given by 

Solution:
Let n be the number of holes drilled in the work bench
Area of the entire work bench before the holes are drilled - ( n × Area of one hole ) = area of the work bench that is left after the holes are drilled.
Therefore,
 = area of the work bench that is left after the holes are drilled.
 = area of the work bench that is left after the holes are drilled.