The puzzle. Eyeballing it wasn't working out and I couldn't be bothered to actually write it down to figure it out. But then again I was also listening to music

The puzzle. Eyeballing it wasn't working out and I couldn't be bothered to actually write it down to figure it out. But then again I was also listening to music in a language that I'm learning, so some thought power was tied up. BTW re the prompt problem... several persons actually solved it and the prize was claimed.