Mrs. Carlson would be so proud

Mrs. Carlson, my 7th grade math teacher, would be so proud of me. I have used so much algebra resizing the Dublin Bay socks I feel like I should have a degree in finding "x". Instead on casting on 72 st, I cast on 60 so I need to find the ratio for each increase/decrease.

18 n
--- = --- 72n=18(60) n= 1080/72 n=15
72 60

Too make this even more impressive to Mrs. Carlson, I am doing this longhand and showing my work. I guess I earned my gold star today- that is until I find some mistake I made 10 rows after the fact but that hasn't happened yet.