It's too variable to give you a good answer with that. I bought a 10 month old snake that was 150g and a 3 month old snake that was over 300g.

A better question for you to ask is what a good feeding regimen is for a snake of X weight. We need to know what X weight is to give you a good answer.

What is the physical condition of the snake? When it bends, does the crease make 1 or 2 wrinkles or many? Is its body very firm all the way around or kind of flat and soft? Can we see pictures? I think they would help most, especially if you don't have a scale.