Question

If J = 12 then J/3 + 3 What is J

Answer 1

Well i think your asking what is J divided by 3+3 which is 4+3 =7 or IF multiplying which is 36 +3= 39

Answer 2

Well, you're given that $J=12$. I think the extra information is extraneous, unless there's something more that you forgot to add.
Hope I could be of some assistance. :)