To find the ratio of yellow paint to the total amount of mixed paint, we start by determining the total amount of paint based on the given parts of yellow and blue.
We have:
- Yellow paint: 3 parts
- Blue paint: 2 parts
The total amount of mixed paint is: \[ 3 \text{ (yellow)} + 2 \text{ (blue)} = 5 \text{ parts} \]
Now, to find the ratio of yellow paint to the total amount of mixed paint, we set up the ratio: \[ \text{Ratio of yellow paint to total paint} = \frac{3 \text{ (yellow)}}{5 \text{ (total)}} \]
This can be expressed as: \[ \text{Ratio} = 3:5 \]
Therefore, the ratio of yellow paint to the total amount of mixed paint is 3 to 5.
The correct answer is: 3 to 5.