Answer:
1 ring
Step-by-step explanation:
10 items total
Half are necklaces = 5 necklaces out of the total 10 items
2/5 of the other items are bracelets = 2/5*10 = 4 necklaces total 10 items
This leaves only the rings, and 5 + 4 = 9, so 10 - 9 = 1 ring out of the total 10 items.
Hope this answer helps! Don't have to mark as brainliest, I'm just happy I got to help you.