Final answer:
The original size of the bottle is 5 ounces.
Step-by-step explanation:
To find the original size of the bottle, we can set up an equation using the given information. Let's denote the original size as x. We know that the new size is 10% less than the original size, which can be expressed as:
x - 0.10x = 4.5
Simplifying this equation, we get:
0.90x = 4.5
Dividing both sides by 0.90, we find:
x = 5
Therefore, the original size of the bottle is 5 ounces.