How to solve this seemingly simple question that requires logic.

Hello everyone, I'm new here... Okay, so I came across a particular question on a particular site, it looked seemingly simple, but somehow I missed it, check it out and tell me what you think. If a > 0 and 6 a = 5 b , which of the following must be true? If a > 0 and 6 a = 5 b , which of the followi...