To determine the ratio of the vanilla cupcakes to the total number of cupcakes that Amanda bakes, we first calculate the total number of cupcakes:
- Chocolate cupcakes: 14
- Vanilla cupcakes: 18
- Strawberry cupcakes: 6
Total cupcakes = 14 + 18 + 6 = 38
Now, the ratio of the vanilla cupcakes (18) to the total number of cupcakes (38) is:
\[ \text{Ratio} = \frac{18}{38} \]
This can be expressed as:
18:38
Therefore, the correct answer is 18:38.