16 give or take 5. This could change a lot when dummy comes down since their range is 0-8. We pick the middle number of ranges (16 for West's 15-17, and 4 for East's 0-8). 20 + 4 + 11= 40. If dummy is closer to 0 or closer to 8, our number will change a lot. The bottom line is that partner will have a pretty good hand. Sometimes partner can have 16 or 17 HCP, but no bid on this auction.