I have a garden trimmer. In very basic/infant terms can someone please explain the fuel ratio 50:1. I have the unleaded fuel/2-stroke oil and a jug marked with litres/mls. But 50:1 what? Buckets, bowls, cups, spoons? I was hopeless at maths and clearly with age I'm getting thicker by the day so please give me the knowledge a 5 year old can understand. For Health and Safety rules, I'm not 5. Just thought you needed to know that. Cheers.