Please help understanding the puzzle. Is it possible we see 18 statues together? (e.g. there is 2 common statues, so I see 10 "own" + 2 "common", and friend se

Please help understanding the puzzle. Is it possible we see 18 statues together? (e.g. there is 2 common statues, so I see 10 "own" + 2 "common", and friend sees 6 "own" + 2 "common"?) So, would that count as 18 or as 20 anyways?