20 ribbons
Explanation:
1st day— 5 ribbons
2nd day—2 x 5 = 10 ribbbns
3rd day— 2 x 10 = 20
Hope this helps
You add all the numbers & divide it by how many numbers 8 +9+9+9+10+10
Wish I knew need the same answer
There are so many relationships between the original entity and new relation.
The relation mapped from an entity involved in a 1:1 unary relationship contains a foreign key that correspond to its own primary key. 1 to one foreign key will be unique.
