Answer:
The longest bolt that can be acceptable is 

Explanation:
To find the acceptable measure of the bolt we have to add and subtract the clearance limit.
a.For longest measure of the bolt we will perform addition.
And for shortest measure of the bolt we will go with subtraction.
So the longest acceptable measure of the bolt 

Hope there question b is missing.
b.
The shortest measure of the bolt 

The acceptable measure of the bolt are:
For longest it is 
 and for shortest it is
 and for shortest it is 
