You can put this solution on YOUR website! You get one answer
16=a 21=b
Three simple Website rules
a) Limit 5 problems within 24 hours
b) No similar problems
c) Submit one problem one at a time once
Two is not one.
No similar problems
Similar means they are the same type problem but differ by the numbers or addition vs subtraction.
What makes you think the rules don't apply to you?