5:1 is literally just equal to 5.
1:5 is equal to 0.2, or one fifth.
Remember that ratios are basically just division. (Okay, this grammar annoys the HELL out of me. How the forget am I supposed to make it? "Ratios is basically just division" makes even less sense, but as it is now, it's off too. forget this.)
https://www.desmos.com/calculator/bqve1ympeuBy the way, why didn't you ask your teacher this when she was teaching? And, if you're 16, why are you doing like 4th grade math?