Shaping raglan armhole

Hello everyone. I am new to knitting. I have been crocheting for many years and have recently started knitting and I’m addicted. :blush: I’m working on a sweater for my daughter and I am a little confused about the next instruction.
I’ve already casted off 4 sts on each side and decreased 1 st at end of next 6 rows. I have 47 sts left (which is what pattern said I would)
The next instruction is:
Next 16 Rows: dec 1 st each end of next and every foll alt row 8 times altogether (31 sts)
Can anyone please explain what this means.
Thanks a million!

Hi Deli and welcome!
You have 47sts on the needle now. Decrease at each end of the needle every other row. So that’s 2sts decreased [I][I]each[/I][/I] decrease row. If you call the next row, row 1 then that’s decreases each end of rows 1,3,5,7,9,11,13, and 15 leaving you with 31sts

Thank you salmonmac! That was a big help!!!
Now Im going to attempt the neck. :flushed: