Ruby Greed Koan -我该如何改进我的if/then soup呢?

I'm working my way through the Ruby Koans in order to try and learn Ruby, and so far, so good. I've gotten to the greed koan, which at the time of this writing is 183. I've got a working solution, but I feel like I've cobbled together just a bunch of if/then logic and that I'm not embracing Ruby patterns.I'm working my way through the Ruby Koans in or