The difference in a brass rod and steel rod is same as 12cm at all temperature .Find the length of the rod at 0°C.

I think its 12 cm itself. Because in the question it is said that the length is same in all temperature

i dont think you are wrong for wanting to get even with someone who did you wrong.

(i'm an eye for an eye kind of person) but if this person hurt you in a sexual way, i dont suggest doing anything to him. he should be taken to the proper authorities, you could go to jail depending on what you do. if it was something small like your sibling took your spot on the couch, than yea, i would get even with him by taking one of his favorite snacks lol. but i dont suggest you doing anything illegal.