Try multiplying both sides of the equation by 5/3. This nets you an answer of a = 20.
My girlfriend's son brought home a question from one of his 8th grade friends. My brain has been out of the game for a while and I was asked to help solve this. The student was given no context, but the problem is:
3/5 a = 12
This is probably elementary to most of you, but I'd be grateful for the assistance.