Needing help with Operating Systems questions please, I thank you in advance

Use the code below to answer the following questions:

for(int x = 0; x < 20; x++) z(x) = a(x) + b(x); 

If a system contains(1) processor, how many steps are required to perform the code above?

If a system contains (5) parallel processors, how many steps are required to perform the code above?

If a system contains (10) parallel processors, how many steps are required to perform the code above?