cabin fever reply

I emailed them about my sweater math problem and they said:

Hi Hillary,
You are quite correct. That would not add up. It should read
"measures 13 (15)" from the Divide Round" then it would end up to be
22" long when the last stripe rolled up at the bottom.
Thanks for pointing that out. I'm glad when knitters find our errors
so they can be corrected.
Thanks again,Deb Gemmell

So, at least I know now :)